Change IE conditional statement so alert appears on IE7

Bootstrap 3 no longer supports IE7. The roots outdated browser warning should now appear on anything earlier than IE8.
Predefine Modernizr function to avoid JSHint errors
Merge pull request #875 from weslly/jshint-predef-modernizr

Predefine Modernizr object to avoid JSHint errors
Merge pull request #873 from kevinlisota/patch-1

Change IE conditional statement so alert appears on IE7
Merge remote-tracking branch 'upstream/master'