Merge pull request #385 from mauler/fix-haystack-search

Fixes haystack search
Fixes paginte_limite parameter on API
Adds get_tags_counter templatetag

Useful tag to return most common tags on the database, very
recommended to cache the block that use it.
Merge branch 'feature-get_tags_counter' into sandbox
Merge branch 'fix-issue-386' into sandbox