[add] function to get tags by entry
[add] send tags to article view
[add] tags displaying
[add] create tags page
[add] edit tags page
[change] simplify Tools::getTplFile
[add] page which lists entries for a tag
[add] rss for tag
[add] assign and remove a tag to an entry
[add] tags and tags_entries tables in poche.sqlite
[add] tags and tags_entries for mysql & postgresql
Merge pull request #356 from inthepoche/tags

Tags feature