state: ParseTag now returns interface ids

Instead of assuming that all collection ids will be strings, they are
now returned as interface{}. This is required to support subdocument
style document ids.
Merge pull request #885 from mjs/parsetag-to-return-empty-interface

state: ParseTag now returns interface ids

Instead of assuming that all collection ids will be strings, they are now returned as interface{}. This is required to support subdocument style document ids (coming soon).

http://reviews.vapour.ws/r/148/diff/