rtMedia upload bug for files having names like "file%20name%20".
Revert "rtMedia upload bug for files having names like "file%20name%20". "

This reverts commit 66114193709a79763f96ee67eeef71a0d1dc253e.
Merge branch 'master' of https://github.com/rtCamp/rtMedia
rtMedia upload bug for files having names like "file%20name%20".
replaced depricated function 'is_site_admin' call to 'is_super_admin' , fixes single media view for non-authers
Bug fixed for - when context was not passed for the anywhere uploader, the activity was not being created, removed urldecode for filenames having "ex : %20" and replaced "%" with "-" as it was showing 404 if the same image was uploaded multiple times.
Merge branch 'master' of https://github.com/rtCamp/rtMedia
extra code removed.
Merge pull request #418 from pushpakpop/master

few core plugin bug fixed, bug fixes for sidebar uploader