Merge upstream/master into react-1257

pig-latin: improve documentation (exercism#1352)

add "Running the tests" section to README template (exercism#1271)

* add "Running the tests" section to README template

* regenerate README files with new template

* rewrite Running the tests section for clarity

* -switch to a plaintext-readable format
-add link explaining py.test vs pytest

queen-attack: re-implement according to canonical data 2.1.0 (exercism#1351)

* queen-attack: re-implement according to canonical data 2.1.0

* queen-attack: rewrite to pass tests v2.1.0

* queen-attack: remove redundant tests

Rm `test_invalid_position_can_attack` since `Queen()`

grains: update tests to v1.1.0 (exercism#1357)

Fix typo and minor style issues in all READMEs (exercism#1356)

* Fix typo and style in README template

* Fix `shold` to `should`
* Fix minor style issues in `### Common pytest options`
* Add blank line after all headers

* Regenerate all READMEs

* Remove redundant periods in READMEs

add `awaiting review` exempt label to stale.yml (exercism#1364)

go-counting: adapt tests to canonical data v1.0.0 (exercism#1360)

* set correct canonical data version

* adapt tests and example solution to canonical data 1.0.0

* use assertSetEqual() consistently

sgf-parsing: implement exercise (exercism#1359)

* implement sgf-parsing

* fix import statement

* create entry in config.json

* fix __eq__ for Python2

lens-person: forego exercise (exercism#1299)

* lens-person: forego exercise

`lens-person` is specific to languages with immutable data (i.e. Haskell). This concept does not exist in Python, so the exercise should be foregone.

* remove bad comma

Implement exercise bank-account (exercism#1260)

* Implement exercise bank-account

* bank-account: generate README using configlet

* bank-account: fix typo and comments

pascals-triangle: update tests to canonical-date v1.2.0 (exercism#1164)

house: return singleton list for single verse (exercism#1354)

* house: return singleton list for single verse

RE exercism#1347 ([comment](exercism#1347 (comment)))

* house: fix example solution to pass changed tests

meetup: remove fail-safe for undefined MeetupDayException (exercism#1345)

* meetup: remove fail-safe for undefined MeetupDayException

Fixes exercism#1344

* meetup: define MeetupDayException in example solution

* meetup: fix example solution to raise correct exception

* meetup: fix flake8 violations

* meetup: add exception message

Curriculum (exercism#1355)

* select core exercises and set exercise ordering

* add missing obvious topics

* make list-ops a core exercise

* rational-numbers: increase difficulty

* unlocked_by core exercises only (exercism/configlet#61)
Ref: exercism/DEPRECATED.v2-feedback#61 (comment)

alphametics: mark computationally intensive test as extra-credit (exercism#1358)

* alphametics: mark computationally intensive test as extra-credit

While this test is canonical, it does not technically add additional coverage. This test serves as a test for efficiency (exercism/problem-specifications#1024 (comment)) of a solution, not completeness.

Furthermore, here are the run-times for this exercise from the [latest Travis build]() (at the time of this writing):
| Python Version | Run-time (seconds) |
| --- | --- |
| 2.7 | 3.155 |
| 3.3 | 2.461 |
| 3.4 | 3.567 |
| 3.5 | 7.270 |
| 3.6 | 0.774 |

Notice that the optimized example solution is only "fast" in 3.6.

* alphametics: add to list of exercises allowed to skip tests in CI

bank-account: update README using configlet (exercism#1366)

go-counting: update README to latest description (exercism#1367)

bracket-push: update tests to v1.3.0 (exercism#1369)

isbn-verifier: update tests to v2.4.0 (exercism#1373)

* Replace test case - "invalid character in isbn"
* Add test case with only 9 digits

Python "bowling" test issue. (exercism#1372)

Fixes /exercism/python/exercism#1371.

yacht: implement exercise (exercism#1368)

* yacht: implement exercise

* yacht: use enumeration of score categories

* Use enumeration instead of plain strings to represent categories
* Improve func `ns` in example solution

crypto-square: Clarify rectangular output requirement in README (exercism#1375)

scale-generator: clarify docs. (exercism#1374)

* Removed most mentions of terms that were irrelevant ("diminished interval") or undefined ("accidentals").
* Removed irrelevant table
* Some light reformatting

.github/stale.yml

@@ -9,6 +9,7 @@ exemptLabels:
   - epic
   - enhancement
   - beginner friendly
+  - awaiting review
 # Label to use when marking an issue as stale
 staleLabel: abandoned
 # Comment to post when marking an issue as stale. Set to `false` to disable