fixes 288.  Fixed DELETE requests in REST API.
Fixed positional argument
fixed the rest of delete API calls
fixed more of delete API calls :)
Enhanced the end to end test script for testing combinations of all OS and providers.
added oauth and ssl support to the end to end test.
fixes 287.  Added utility method for reading credentials and fixed method for reading provider info.
actually added the new utility method for reading credentials file
Merge pull request #291 from aeolusproject/bugs/delete_not_working

Bugs/delete not working
Merge pull request #290 from aeolusproject/test/end2endTest

Test/end2end test
Merge pull request #292 from aeolusproject/bugs/cli_delete_not_working

Bugs/cli delete not working