Adding start_at and end_at to :tagged_with
Adding test to check tags outside date range
Adding start_at and end_at to :tagged_with
Fixed tag_cloud helper to actually generate the correct css tags

Changed the count method to taggings_count, which looks to be a true property on the ActsAsTaggableOn::Tag object, and fixes the tag_cloud helper.
add back the taggables index in the taggings table
Merge pull request #555 from TheLarkInn/master

Fixed tag_cloud helper to actually generate the correct css tags
Merge pull request #556 from pcai/master

add back the taggables index in the taggings table
Merge pull request #488 from felipeclopes/master

Adding start_at and end_at to :tagged_with
`tag.destroy` will never execute since `taggings_count` was cached in memory.

* ruby (2.1.2)
* rails (4.1.1)
* acts-as-taggable-on (3.2.6)

This commit fix the bug and add a test as well.
Merge pull request #560 from tonytonyjan/patch-1

Fix `ActsAsTaggableOn.remove_unused_tags`
Merge remote-tracking branch 'upstream/master'