Added ENV variable functions
Moved environment variables to constants file
Updated to use empty comparison rather than nil comparisons for username & apikey
Test get-disk methods for username, password, apikey using temp file
Finished explicit login function. Added placeholders in identity_test for new login functions
Merge pull request #19 from scadams/master

Test get-disk methods for username, password, apikey using temp file
Merge branch 'master' of https://github.com/oubiwann/clj-rackspace

Conflicts:
	src/rackspace/util.clj
added functions to get additional response variables
Removed get-password-or-apikey function, changed argument evaluation order.
Merge pull request #1 from mcoupland/master

Removed function, changed variable order in cond