Added CSS for Spreadsheet view support.

git-svn-id: https://plugins.svn.wordpress.org/wpgform/trunk@804978 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added jQuery to hide Powered By section when in spreadsheet view.

git-svn-id: https://plugins.svn.wordpress.org/wpgform/trunk@804980 b8457f37-d9ea-0310-8a92-e5e31aec5664
Prep for v0.59 release.

git-svn-id: https://plugins.svn.wordpress.org/wpgform/trunk@804982 b8457f37-d9ea-0310-8a92-e5e31aec5664