minor fixes

1. Updated the title of the twbs3_3col_col3-6-3.ascx layout control to
correctly identify column ratio (25% - 50% 25%)
2. Added minified version of Modernizr 2.6.2 to resolve error in
twbs.master master page.
3. Modifed CSS in sfproject.css to resolved spacing (margin) issue in
columns.
Merge pull request #4 from sstotler/master

minor fixes by @sstotler.
Modified css in sfproject.css should have been fixed by issue #3 - will reopen and apply to .less instead of .css