Combine multiple metadata files to 1

The individual deployment metadata files are now 1 single metadata.json
file

Correct bug where you got an error trying to add e.g. mysql to a
scalable app

Update deployment pruning algorithm so it removes the oldest deployment
by latest activation time, and then deletes any activation metadata
prior to the latest activation time of the deployment being deleted
across all deployments

Removed all rollback-related code, as rollback is the same thing as
activate
Merge pull request #40 from ncdc/deployment-metadata-json

Combine multiple metadata files to 1
bug fixes
fixed typo
Allow for floats with time storage
add sha to deployment
Merge pull request #41 from danmcp/lnader

bug fixes
Stop using a deployment as a creation mechanism for a deployment
Consolidate activate/activate_gear