Adding --organization / -O switch
If an organization was specified, use that to fetch the repositories.
If an organization was specified, use it for fetching forks & issues.
Adapted README
If a password is present, use /user/repos instead of /users/:username/repos. refs #16
If an organization was specified, use that to fetch the repositories.
removed bogus space in command
Simplified url generation
Merge branch 'organisations_ftw' of git://github.com/centralway/github-backup

Conflicts:
	lib/utils/options.rb
updates version 0.4.0 -- adds organizations support