Bug 951069 - [1.4] Month view visual refresh

### Summary

+ Add an element to the `#months-day` section to display the current day above the events
+ Edit `Template.Day` to match the new `#months-day` ui
+ Only use the first letter of the weekday in the months view week header
+ Add up to 3 `&bull;` to each `.busy-indicator`
+ Override `#changeDate` in `View.MonthsDay` to update the current day dynamically
+ Add months-day specific styling to `day_views.css` by namespacing under `#months-day-view`
+ Aesthetic changes to month view in `ui.css`
+ Remove styling for busy bars and hide them by default