Canvas layout
[Canvas layout] insert empty columns logic updated
[Canvas layout] tests added
Canvas layout test improvements
CR fixes
Strip tags using regexp (less XSS prone and way faster)
Put stripTags regexp to the special hash
Use $.each instead of Array.forEach since we support IE8
Arrange apps into columns if screen width gt 400px only
Merge branch 'evseev/canvas-layout-gridster' into rc3.0.26
[Tests] viewport meta tag added
[Tests] skip tests for canvas layout if screen width lt 400px