DTagLib Upgrade to dub

I wanted to use TagLib, so I upgraded the project to use dub for building and dependencies. It won't work on windows without some more work on the package file, but at least it can build on Ubuntu 14.04 (and probably others) without any hassle (with libtagc installed).

I would like to add this to dub. I can keep this as a fork and just add it to dub, but it would be nicer if it were in the base, so I'll wait until this either get's accepted or rejected before I do anything.