Upgrade to Rails 4.

Closes #34
Add information to Readme about new Rails 4.1
branch.
Allow the setup of abstraction schemas to be
namespaced.

Closes #35
Remove all inline JavaScript
(and convert to CoffeeScript).

Closes #37
Remove cruft left over from the extraction of
the gem from original application: CSS, JavaScript.

References #39
Make the abstractor:install generator smarter
about inserting default configuration.

Closes #38
Force the loading of all dependent JavaScript
into the host application.

Closes #40
Improve the display of version history for an
abstraction.

Closes #42
Replace hard coded values with enum values.

Closes #43
Remove cruft left over from the extraction of
the gem from original application: CSS, JavaScript.

References #39

Convert to Rails 4 way of confirmation dialogs
on links.

Closes #44
Soft deleted rows should not be included in
abstraction groups.

Closes #45
Merge branch 'rails-4' of github.com:NUBIC/abstractor into rails-4
Bump to version 4.0.
Merge branch 'rails-4' of github.com:NUBIC/abstractor into rails-4
#46 Allow to filter abstraction groups by subject group.
Merge pull request #47 from NUBIC/46_allow_to_filter_abstraction_groups_by_subject_group

46 allow to filter abstraction groups by subject group