better looking login modal with working cancel button
added less for validation styles.  Added dotless to compile less files at startup.  Had to hack some bootstrap less files because dotless is unable to compile the most recent version of bootstrap yet (there is an issue in the dotless github repo).  The fix should be functionally equivalent.  Details here http://stackoverflow.com/questions/21940204/dotless-on-azure-web-project-doesnt-understand-extend.