Implemented system process wrapper and avconv-based video converter.
Added missing files.
Fixed wrong attribute for link stylesheet include (rel instead of ref)
Fixed handling of SVG images
Fixed issue with single-line input field rendered in auto-backend mode
changed mainly the "Components"
corrections based on comments
Merge branch 'master' into jcodec
Merge master into jcodec.
Merge branch 'jcodec'

Conflicts:
	structr-ui/src/main/resources/structr/js/entities.js
	structr-ui/src/main/resources/structr/js/websocket.js
Merge pull request #255 from lazaridis-com/master

Several Issues
Merge branch 'master' of github.com:/structr/structr
Don't try tp display thumbnail for .ico images as well.