Remove node_modules and bower_components from VCS

Having node_modules and bower_components in version control causes
dependency issues across different platforms, especially when different
global packages are installed. Instead, npm install and bower install
should be run once the project is cloned.  This commit fixes dependency
issues so “grunt serve” can run (grunt-cli will need to be installed
first via “npm install -g grunt-cli”)

Additionally, the “cwd” option is removed from the wiredep section of
the Gruntfile: http://stackoverflow.com/a/25713634/2079798
Comment out BS classes using 24-col grid

.compose-bar-content and #thread-column extend Bootstrap column classes
that aren’t defined in a 12-column grid, so comment them out so that
the stylesheet can compile. @asarode will need to fix this
Update quibit subproject ref to latest on master