fix greater/smaller filters for pymongo

filter never worked, because value is passed as string and mongodb returns zero documents
Made InlineFieldList compatible with WTForms 2
WTForms 2 compatibility

Replaced deprecated TextField with StringField
No meta needed for template creation
Merge pull request #676 from arsgeografica/wtf2

WTForms 2 compatibility
Fix incorrect usage of NotImplemented

`NotImplemented` is a constant singleton used in rich comparison
overloading. It is not callable, and is not an exception.
`NotImplementedError` is a built in exception.
Merge pull request #685 from ajalt/master

Fix incorrect usage of NotImplemented constant
Merge pull request #660 from Raz0r/patch-6

fix greater/smaller filters for pymongo
add support for time filter
change function name for new filter
fix notes on form_widget_args
use bootstrap-daterangepicker as for timepicker, datetimepicker, and datepicker
change momentjs version for bootstrap2
fixes issue #621 and #603 for bootstrap2
Travis shall use WTForms >= 2
Add missing meta for InlineFieldList
Travis build matrix for WTF 1&2
Support WTF 1&2
Set cover-package for running tests
Merge pull request #693 from singingwolfboy/cover-package

Set cover-package for running tests