Thanks for making this, it's been really useful.
I was reading the docs and it appears that the TVDB API now handles it's own load management, so there's no
need to request mirrors.xml or retrieve one at random.

http://thetvdb.com/wiki/index.php?title=API:mirrors.xml
Realised it would make more sense to completely remove the Mirrors class and get rid of some of the error handling surrounding the calls to getXmlMirror and getBannerMirror.

Changes appear to pass al JUnit tests
Merge pull request #6 from shaggythesheep/deprecated-mirrors-xml

Deprecate mirrors.xml