Interim release - Bring runResourceT inside runMinio

Version 0.3.0

This release includes a breaking change:

Users of the library need not call runResourceT explicitly after
calling runMinio. This is now done, within the runMinio call
making usage a bit simpler.

Other changes:

• Export ListUploadsResult and ListObjectsResult (#48)
  • Also take max-keys as an argument for listObjects and max-uploads
    for listIncompleteUploads.
• Add bucket and object name validation (#45)
• Add bucketExists and headBucket APIs (#42)