Numerous optimization updates
- Renamed use of habitat.local.yaml to just Habitat.yaml for simplicity.
- Configured phpMyAdmin to use the habitat/tmp folder for import/export actions.
- Added ability to specify RSA keys to apply to the VM so that private repositories can be accessed from the VM.
- Added ability to specify ~/.ssh instead of fully qualified path on most systems.
- Added ability to add custom mappings to override default synced folder paths. This is mainly to allow specifying a different source dir to be mapped to the default /home/vagrant/web/ used by the default vhost configurations.