fix issue 38
Merge pull request #41 from ywang19/FIX_ISSUE_38

fix issue 38, ceph has different return status code returned if successful login, should check status code to range 200-299.
fix issue 15: support SSL with self-signed certificate
Merge pull request #43 from ywang19/FIX_ISSUE_15

Fix issue 15, and 36 (s3 adapter alpha version)
fix issue 42: support space heading parameter
Merge pull request #44 from ywang19/FIX_ISSUE_42

fix issue 42: support space heading parameter