Revert "restructing bootstrap files"

This reverts commit 8c16b7c8e725b3cddb244ca77973935e56d360f3.
add bootstrap less files
restructure less styles
add custom boostrap styles that separates bootstrap modifications from original bootstrap style
separate stylesheets should make it easier to upgrade bootstrap in the future
replace glyphicons with font-awesome
add custom bootstrap less stylesheet to base page
remove old stylesheets
remove old stylesheets