First commit of develop branch.
Fixing capitalization issue.
Renamed Tests to tests
Adding tests folder.
Removing .DS_store file.
Removed some old comments.
Added unit tests for bymonth and bysetpos, and corrected issues found in the process.
Added ability to check if a date is valid or not.
Alpha version of version 2, lacking support for wkst and bysetpos
Added functionality for wkst and bysetpos
Added rrule parser, and unit tests
Default value for  should be monday
Changed README and added travis
Modified travis config to update composer
Added travis images to readme and fixed travis config for composer
Fixed 'occurrence' typo throughout.
Correct typo of occurrence in readme
Fixed bug with weekly recurring events
Merged with develop