Added the ability to link an already-existing Parse.com account with a Facebook account
Added saveAllObjects call to save multiple objects
Providing _createdAt and _updatedAt when retrieving objects, also simplified updating of an object.  And added in closeFbSession.
Merge branch 'master' of git://github.com/ewindso/ios-parse-titanium-module

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.

Signed-off-by: Peter <peter.tikhomirov@gmail.com>