Improve argument parsing, fix style

.flake8

@@ -0,0 +1,10 @@
+[flake8]
+max-line-length: 80
+# Whether to display the pep8 instructions on failure (can be quite verbose)
+show-pep8: False
+# Whether to show source code for each failure
+show-source: True
+# Maximum cyclomatic complexity allowed
+max-complexity: 14
+format: pylint
+exclude: .git,.idea,.eggs,__pycache__,.tox

.gitignore

@@ -1,6 +1,10 @@
+# Python
 env
 build
 dist
 *.egg-info
 *.pyc
+
+# IDE junk
+.idea/*
 *.swp

README.md

@@ -18,27 +18,38 @@ Done!
 
 ## configuring
 
-Generate a new token in [application settings][1]. It should have the repo scope.
+First, [generate a new token](https://help.github.com/articles/creating-an-access-token-for-command-line-use). It should have
+the repo scope.
 
-Put the key in ~/.netrc, which should have mode 0600 (`-rw-------`):
+Then, there are two options:
+
+* Set the `GITHUB_TOKEN` environment variable:
+
+```bash
+export GITHUB_TOKEN=...
+/path/to/command
+
+# or 
+
+GITHUB_TOKEN=... /path/to/command
+```
+
+
+* Put the key in `~/.netrc`, which should have mode 0600 (`-rw-------`):
 
 ```
 machine api.github.com
 login [TOKEN]
 password x-oauth-basic
 
-machine upload.github.com
+machine uploads.github.com
 login [TOKEN]
 password x-oauth-basic
 ```
 
-Done!
-
-[1]: https://github.com/settings/applications
-
 ## installed scripts
 
-The package installs two scripts, github-release and github-asset
+The package installs two scripts, `github-release` and `github-asset`
 
 ### github-release
 
@@ -94,5 +105,3 @@ $ github-asset octocat/example-project download 1.4
 $ # download all files from example-project
 # github-asset octocat/example-project download
 ```
-
-