Minor formatting change

Offset a block closer to the left...
Fix some doc-related comments

Also use a flat directory structure for LFSClient classes.
Maintenance fixes

With directory restructuring in the previous commit, some headers
were not copied to a public directory. In addition, merged some
client-test updates from AFNetworking and now performing those
tests on the LFSBaseClient (as opposed to LFSBootstrapClient). This
should ensure better robustness.