reorganizes modules, adding snapshot-common and snapshot-service
Adds state transitions to the step listeners.
Updates the path for DTOs. No functional changes.

Conflicts:
	snapshot-bridge-webapp/src/main/java/org/duracloud/snapshot/bridge/rest/RestoreResource.java
Adds a setting in the bridge webapp to point to the spring application context xml file. This allows the app to startup when deployed to tomcat.
Adds support for get snapshot content and get snapshot list.
Minor tweak to bring get snapshot list call into line with the docs.
Merge branch 'feature/add-content-and-props-to-db' into develop

Conflicts:
	snapshot-bridge-webapp/src/main/java/org/duracloud/snapshot/bridge/rest/RestoreResource.java
	snapshot-bridge-webapp/src/main/java/org/duracloud/snapshot/bridge/rest/SnapshotResource.java
	snapshot-bridge-webapp/src/test/java/org/duracloud/snapshot/rest/SnapshotResourceTest.java