Enforcing max cluster and max node settings within a tenant.
Trying to create a cluster that violates the max will cause the
request to fail with a 409. Similarly, trying to lower the max
below whats already in use will cause the request to fail with a
409.
Merge remote-tracking branch 'origin/develop' into feature/tenant-quotas
fix doc typo and fix lock namespace.
Merge remote-tracking branch 'origin/develop' into feature/tenant-quotas

Conflicts:
	CHANGELOG.md
	server/src/main/java/com/continuuity/loom/admin/Tenant.java
	server/src/main/java/com/continuuity/loom/provisioner/TenantProvisionerService.java
	server/src/test/java/com/continuuity/loom/provisioner/TenantProvisionerServiceTest.java
Merge pull request #302 from continuuity/feature/tenant-quotas

Enforcing max cluster and max node settings within a tenant.