get remote file size mp3
get remote filesize ogg
get remote filesize webm
get remote filesize mp4
fixing 'Downloadf' in German translation
added URL validation for remote files
unnecessary conditions removed
LAMBDA-69: urlvalidation and size hooked to save
LAMBDA-69: new link validation, urllib2, wp_embed
LAMBDA-69: use URL for check instead of size
LAMBDA-69: fix 500er when no size is stored
LAMBDA-69: make HEAD request to get size
LAMBDA-69: refactoring signals.py
Merge branch 'remote-size' into dev

Conflicts:
	portal/models.py
Merge branch 'dev' of github.com:LambdaCast/LambdaCast into dev