Changes

Code was reviewed, and a few small adjustments were proposed (i.e. trailing whitespace, not defaulting a combobox, etc.) and the changes were addressed. A followup discussion was proposed for the next meeting on the return value of the authorize function. Final pull request was created.

As stated in the original proposal, the initial goal of the Google Summer of Code project was to develop a backend connector that would allow access to selected protocol-based contact storage servers for the Ensemble Thunderbird Address Book Add-on. Initially, the top two desired protocols were CardDAV and LDAP, and upon further research and discussion, it was chosen that a CardDAV backend connector would be the selected development goal for the summer term.