Enabled version 3.0

git-svn-id: http://plugins.svn.wordpress.org/wp-mpdf/trunk@763168 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated mpdf to version 5.7.1
Added missing folders
Prepared version 3.0.1

git-svn-id: http://plugins.svn.wordpress.org/wp-mpdf/trunk@765882 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added new cache directory for mpdf
Fixed template loading
Removed not needed files
Added git ignore
Fixed tmp path
Updated mpdf to version 5.7
Prepared 3.0 release
Added intellij project files to git ignore
Merge branch 'master' of github.com:fkrauthan/wp-mpdf