Allow commands to operate over system apps, in addition to user apps.
Allow user apps to override system apps for the case where the user has
created an app with the same name as one already provided with the SDK.
Merge branch 'develop' into system-app-support

Conflicts:
	brjs-core/src/main/java/org/bladerunnerjs/appserver/ApplicationServerUtils.java
	system-app-servlets/src/test/java/com/caplin/cutlass/app/service/RestApiServiceTest.java
Merge pull request #704 from BladeRunnerJS/system-app-support

Allow commands to operate over system apps, in addition to user apps.