* some notices/warnings ere removed.
* cache directory detection was changed to avoid problems with symlinked filesystems.
* some caching functions were rewritten.
* a cache dir creation warning was added to the admin config panel

git-svn-id: https://plugins.svn.wordpress.org/fb-linkedin-resume/trunk@911960 b8457f37-d9ea-0310-8a92-e5e31aec5664