Initial commit of tokens_api - thraxisp/myself believe it's stable, however some unused future API functions are incomplete.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@3160 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9