Added Composer PHAR for portability.

Update to dependencies.
Added Vagrantfile to specify a build and test environment. Using avenuefactory/lamp box at the moment. Open to change and further configuration in the future.

Ammended gitignore to include .vagrant directory.
Slight code quality updates to services. Refactored MeetingService to include more concise and descriptive methods for retrieving historical meetings vs. scheduled meetings.