Initially added GetTranslations API method, http://msdn.microsoft.com/en-us/library/ff512417.aspx
API call to GetTranslations now working
Tests passing
Indentation and method changes based on PR comments
Finish GetTranslations call

I've removed the category option, since it is not clear which options
a user has here. I added some lines about the new GetTranslations call
to the README file. The response is converted to TranslationMatch
objects.