Bug fix release

Release version 4.7.15

Release version 4.0.0

Release v3.1.1

Majer changes:
- upgraded to the latest submodule version (bootstrap-datetimepicker v3.1.1)
- compatible with the latest momentjs library (version 2.8.1)
- included the simpleform & momemtjy dependency in gem's Gemfile

Release v3.0.3

New feature: custom icons
Made some bug fixes and Readme corrections.

Release the v3.0.2

tarruda/bootstrap-datetimepicker-datetimepicker-core datetimepicker-c…

…ore.js & .css upgraded to bootstrap 3

Merge pull request zpaulovics#2 from dansimpson/master

Disable time picker overlay for date_picker input