Merge pull request #136 from msevestre/master

Fixes #135
changed twitter url
Exclude current post's revisions from validation

When searching thru the candidates for the uniqueness validation, the
current post's revisions should be excluded so it doesn't create a
different url when not necessary.
Merge pull request #140 from mixandgo/master

Exclude current post's revisions from validation
Merge pull request #138 from samtreweek/master

twitter url changed
Rename current_user in monologue__current_user to avoid conflict with other engine using the current_user method from devise
Merge branch 'rename_current_user' of github.com:msevestre/monologue into rename_current_user