Updated to HAML4 and started switch to Bootstrap
First-stab at invitations index mock
Converted to Bootstrap from Foundation
Converted mock for invitations page to bootstrap.

Next up is building the JS and interactivity details; yay!
Sprucing up the sign-in forms
Fixing backbone templates for bootstrap; fixed confirm events
Playing with different JS/HAMLC options
Fixing event page invitation details
Adding completion bar mock to invitations page
Converting to LESS and finalized design of invitations index.
Added JS for invitations index view

Added the initial phase of the invitation status update
on the index page.  Next steps are to make the buttons
easier to read/see and to refactor the display to make
that status clearer for each section.

Still need to add in an easy way to add guests...
Finished the invitation status update

Buttons are larger and easier to see/read.  Colors
highlight status and indicate the steps needed a
little better.
Updated headers to use yield/content_for; moved invitations to main page