Remove obsolete html/css.
Add client-side Skydrive support.

Details:
1. Add Skydrive mediatype in content item authoring form.
2. Add CanvasSkydriveItem object in virtualCanvas.
Hint messages for Create Timeline/Exhibit scenarios.
Finalizing merge
Fixing issue with tours authoring window
Merge branch 'skydrive' of git://github.com/alex-zen/ChronoZoom into alex-zen-skydrive
Merge pull request #954 from mkalygin/skydrive-mediapicker

Add UI mockup for SkyDrive mediapicker.
Bugfix for #804: Ticks on axis and markers are now showing convenient time.
Merge pull request #955 from alterm4nn/fix804

Bugfix for #804: Ticks on axis and markers are now showing convenient time