Created widgets for basic "object" cases (IContactInfo, IPostalAddress)
Implemented render() for object widgets not specifying template
Aligned to #24 (widget objects aware of their lookup context)
Implemented #25. Tested with IContactInfo widget.
Renamed glue templates
Added macro for required field mark
Renamed field templates to follow the pattern <action>-<field>-<any-qualifiers>.html
Added field widgets for IFloat
Added field widgets for IURI
Added field widget for IPassword
Fixed bug #26 (zero interpreted as None inside dictizer/loader)
Created glue templates for IFoo widgets
Refactored object widgets (one level deeper in module hierarchy)
Added select2-based widgets (simple selects, tags)
Improved Object.{to/from}_dict (to accept a "serialize-keys" option)
Merged with smanousopoulos/19-widgets
Merge fixes (draft, not tested)
Update pip requirements
Reviewed imports for schemata/types. More PEP8-friendly tests
Attempt to fix bug #27