Bug 833229 - 1/N: rename files
Bug 833229 - 1/N: rename VoicemailProvider to VoicemailService
Bug 833229 - 2/N: wrap arguments list
Bug 833229 - 3.a/N: interfance changes
Bug 833229 - 3.b/N: IPDL implementation
Bug 833229 - 3.c/N: implement MozVoicemailStatus in C++.
Bug 833229 - 3.d/N: DOM implementation
Bug 833229 - 3.e/N: voicemail factory class