Merge branch 'release/2.2.0.3' into develop
Correct _opt_matches_value in MultiSelectionField
Add the title attribute to HTML5PatternMixin

The title attribute results in a tooltip on hoover and an explanation on invalid
values.
Merge pull request #34 from pieterproigia/title_attribute

Add the title attribute to HTML5PatternMixin
Merge pull request #33 from pieterproigia/tw2.forms into develop
Include doc link in README
Remove unknown interpreted text role "meth"

The widget browser doesn't know how to handle that.
Remove more sphinx-specific text roles.

Followup to 10d8826e5ad34f37a5f012e8052b110a7bc5eef6.
Saner management of calendar javascript
CalendarDatePicker and CalendarDateTimePicker were using two different date formats, move both to the international format
Make sure the prompt_text submits an empty value and not the prompt text itself
Add coverage
Report coverage to coveralls
Add coveralls badge to Readme
Initialize calendar JSLinks in module, should fix #35
Travis improvement
Update comments and widget browser sample for calendars
Code style improvements and fixing #37: CalendarBase
Preliminary fix for #38 which seems sane.

Some corner case testing for file upload scenarios (multiple files in
one field etc.) needs to be done.
Broken test case due to toscawidgets/tw2.core#110