[Bug Fix] Added main.less
[Bug Fix] Added main.less

Main.less is the less file that imports all other less files and is
compiled to create a single includable .css file.

This commit fixes a bug with the Grunt Less command where the Less
compiler could not find the non existing main.less file.

rachellcarbone/angular-seed,rachellcarbone/angular-seed,rachellcarbone/angular-seed