add bootstrap sass

bower install;
grunt serve;
switch back to main.scss;
remove compass reset;
body font-size controlled by bootstrap;
styled the nav bar

add bootstrap glyphicons font
styled up meetings page
delete user-status include

modified nav already
checkins page

form validation styled up
switch from bootstrap sass to css

compass grunt process time too long;
plus there is no compass reset conflict anymore;
Merge branch 'using-bootstrap-sass'
styled checkinslist and add deleteCheckin