Merge pull request #9 from mfairchild365/master

Class structure re-write + merge
Remove unused date functions, we can use built in functions in PHP
readability
Remove test skeletons with no implemented tests.
Add a simple active record library
Convert base class names to namespaces which extend active record
Begin work on basic collection class for subscriptions
readability
Correct class name references for Facebook\Instance
Use simplified getById method
readability
Add a model for all subscribed calendars
Use new subscribers model for handling subscriptions
remove unused parameter
Namespace conversion
Namespace conversion
Remove unneeded function, use PHP filter_var for checking URIs
Correct case of file and class name
Add a model for a collection of permissions
Add model for a collection of event occurrences

(formerly DateTime/Instance)