ubuntu-setup.bash: for rubygems, use maverick's repo or if lucid use ppa or if old use tarball. create /var/lib/gems/1.8/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games-friendly symlink if using debs

So that it can run directly when checked out without needing to have
chmod +x ubuntu-setup.bash run first.

Signed-off-by: Daniel Thomas <drt24@srcf.ucam.org>

Adding Diaspora Inc. copyright and reference to the AGPL and noting that
Mackenzie Morgan (maco) and I have made contributions to the file.

Signed-off-by: Daniel Thomas <drt24@srcf.ucam.org>

set -e removed as the rules change from one Bash version to another, as Bash attempts to track the extremely slippery POSIX definition of this "feature". When a SubShell is involved, it gets worse still -- the behavior changes depending on whether Bash is invoked in POSIX mode.

Added a check on if the user has already cloned and also a set -e to exit immediately if a command exits with a non-zero status.

Conflicts:
	app/models/photo.rb

Conflicts:
	app/models/post.rb
	app/models/user.rb
	config/initializers/socket.rb

Added a newline before a list, so that the list can be properly interpreted as a list (Markdown syntax).

This reverts commit 8c0bc4b9.