media manager: file uploader improvements

renamed mediamanager.css to start with underscore

media manager: fixed and improved diff views

Resize images in fullscreen mediamanager using CSS

media manager: improved the panel widths

media manager: improved spacing around option buttons and changed lang strings for them

media manager: fixed option buttons (broken with 94add30)

media manager: added a few newlines to the output

media manager: small functionality and css changes

media manager: styled new option buttons

media manager: more CSS changes

Fix mediamanager JS (diffs not yet working)

media manager: re-newed CSS roughly (more to come)

Rework media manager HTML (JS and CSS will come)

better resize handles in media manager

improved media options css (and removed lots of dead css code)

added styles for general tabs (to be used in mediamanager and other components)

media manager design: added icon to resizing handle and changed background colour

media manager design: more spacing and some colour changes

media manager design: improved some spacing

media manager design: added headline

issue #57, function names, params, html fixes

issue #44 uploader fixes, #45 browser testing

issue #44 new uploader in the media popup

issue #50 styling uploader