Added support for one-off tags with embedded IDs

New proposed feature

This PR relies on PR #10 to merge cleanly, as the implementation needs access to longer tags.

Added support for embedded IDs in a one-off style.
- User places [imdb:title(tt0137523)] in a post to quickly generate a link.
- New code searches for [imdb:<tagname>(<id>)] and converts it to [imdb-<id>:<tagname>].
- New code also adds [imdb-<id>:id(<id>)] to the beginning of the post.
- Processing continues normally from there.

Also works with [imdblive:<tagname>(<id>)].

Tested in PHPStorm 7 to work correctly.

Signed-off-by: Dan Hunsaker <danhunsaker@gmail.com>
Merge pull request #11 from danhunsaker/one-off-ids

Added support for one-off tags with embedded IDs