Finished the new upload way for logos (users and spaces). Now is used the gem carrierwave to upload the images and JCrop/RMagick for cropping the image to the sizes the site want.
Refactored the page for creating new spaces.

fixes #412
fixes #456
Merge branch 'Bug412' into branch-v2

Conflicts:
	app/controllers/spaces_controller.rb
Some changes to accept the new sizes from logos inside the public activity files.Some modifications to accept the new sizes from logos.