add public function getMimeTable()

Return Extention/MIME Table (elFinderVolumeDriver::$mimetypes)
support Data URI scheme uploading

ex. d&d HTML
'<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA
AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO
9TXL0Y4OHwAAAABJRU5ErkJggg==">'
[connector] fix elFinder::parse_data_scheme()
[cwd] correction for touch devices ( fix #266 )
Merge branch '2.x' into 2.x_n
Merge branch '2.x_n' into 2.1_n