First pass at Month View

Summary: Ref T4392, First pass at Month View

Test Plan: Open month view, month view days should correctly grow with number of events, day numbers should now live at the bottom of day cells, day numbers should be links to day views of those days.

Reviewers: chad, epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T4392

Differential Revision: https://secure.phabricator.com/D12800