Check for S3 write permission and show warning if can't write
Add check again link to notice to force override of transient in permission check
Return with early check if transient exists and not force checking.
Error handling for filesystem
Better styling for wide screens.
Code bracket is slightly out of alignment.
<br> tags should be a last resort.
Merge pull request #127 from deliciousbrains/read-only-permission-warning-124

Check for S3 write permission and show warning if can't write