Bugfix for jsexpr with dicts on 0.6

Merge pull request #88 from JunoLab/sl/dicts_on_0.6

BUG: try to fix bug with dict matching on 0.6

Bugfix in error handling

Merge pull request #81 from lwabeke/pull-request/92fb1f34

Change to get rid of error on closing of Blink Window

fixes

v0.5.1

Use Future instead of Condition in Page to allow repeated "loaded?" c…