created function to pull auth creds from env variables
wrote test for get-auth-credentials function in identity
Merge branch 'master' of https://github.com/oubiwann/clj-rackspace
merged upstream master
changing environment variable login
Added ENV variable functions
Moved environment variables to constants file
Updated to use empty comparison rather than nil comparisons for username & apikey
Finished explicit login function. Added placeholders in identity_test for new login functions
Merge branch 'master' of https://github.com/oubiwann/clj-rackspace

Conflicts:
	src/rackspace/util.clj
Merge pull request #20 from mcoupland/master

Added implicit and explicit login