Add dynamically generated help output.
basic support for after_fork callbacks.

closes #16
Add binstub & stop commands in help
Merge pull request #66 from Agis-/patch-1

Add binstub & stop commands in help
Merge pull request #50 from senny/16_after_fork_hook

basic support for after_fork callbacks.
Merge pull request #49 from rjackson/dynamically_generate_help

Add dynamically generated help output.

Conflicts:
	lib/spring/client/help.rb
Avoid using pty in tests

It was causing too many issues and was only being used in our tests
anyway, see #58.

Note that this means that I've had to remove the error if stdin is not a
tty, but I don't really think that matters much. I'm not sure why anyone
would use spring in a situation where stdin is not a tty.
Relax the assert_speedup ratio a bit

There has been the odd failure, this should help.
Refactor tests
Correctly report the exit status of the command

Fixes #57
Refactor assert_speedup
Add `spring status` command