mediafield 5.x-1.01-rc1

Critical bug fix
* Error retrieving node with media field (#146955: Error retrieving node with media field)

General bug fix
* Extension validation now allows for uppercase extensions e.g. ".AVI" will pass if "avi" is allowed (#234469: file extensions are case-sensitive)

UI improvement
* Improved the logic which pics icons to display on the edit pages, will now check for dedicated icon (e.g. mp3.png, if it cant find it then it will use a default, e.g. audio.png)

New features
* Adding AJAX upload feature as patched by panis (#132233: Progress bar - patch for mediafields)
* Now uses getId3 module for Id3 support (#144674: Make getID3() library location user assignable)