Respect S3 policy of access key and fail gracefully

If the user is not allowed to create buckets, catch
exception and move on.
Merge pull request #26 from stefanw/respect-s3-policy

Respect S3 policy of access key and fail gracefully
Refs #25. Define s3_access_key and s3_secret_key as being sensitive arguments that should be be displayed in debug output
Refs #25. Added a test case to show that s3_access_key and s3_secret_key are sensitive
Merge pull request #25 from PolicyStat/issue_25

Don't print S3 secret key in verbose mode / debug level
Bumped version to 1.0.0rc3
Updated long_description
Bumped version to 1.0.0rc4-dev
added the support for pip 1.3.1
added exlude for python2.5 + virtualenv 1.9.1
Merge pull request #31 from littleq0903/supportpip1.3.1

added the support for pip 1.3.1
Refs #32. Added a require download option
Refs #28. Fixed a broken test
Merge pull request #32 from PolicyStat/issue_32

Add a require download flag
Refs #28. Added revert command for restoring previously backed up environments
Refs #28. Added note in the readme about reverting.
Merge branch 'master' into issue_28

Conflicts:
	tests/tests.py
Merge pull request #28 from PolicyStat/issue_28

Add command to restore backup
Bumped version to 1.0.0rc4
Bumped version to 1.0.0rc5-dev