Fit metabox in the sidebar
Fit radio-image into sidebar metabox

Before: http://grab.by/v9Hq
After: http://grab.by/v9Hw
Fix for this error:
Warning: in_array() expects parameter 2 to be array, string given in
/wp-content/plugins/titan-framework/class-option-multicheck.php on line
30
Merge pull request #59 from ardalann/master

Fit metabox in the sidebar + a bug fix. Closes #56