Merge pull request #86 from satrya/master

Wrong Text Domain
New media uploader.
Sanitize file upload for background option.
Fix for options not saving.
Issue #79.  Update navigation tab and group ids.  Sequentially number.
Issue #96.  Add textdomain for colorpicker.  Props @maddisondesigns.
Add update routine.
Add update routine.
Minor spacing updates.
Update readme.
Fix different text domain

Signed-off-by: M.Satrya <satryabima24@gmail.com>