Adds a restricted command check for show_admin_bar and a test case for this
show_admin_bar() call is restricted on wordpress.com and we should catch this in the scanner. This commit is adding a check for this function call as well as a test case for the new check
Fixes merge conflict
Another, pretty similar, test was appended before this was merged - this fixes the merge conflict
Merge pull request #168 from david-binda/showadminbar

Adds a restricted command check for show_admin_bar and a test case