Added basic display of counter
XD-508, XD-551 Triggers: Support pagination in list command

* XD-551 Add "trigger list" support to Spring XD Shell

Jiras:

* https://jira.springsource.org/browse/XD-551
* https://jira.springsource.org/browse/XD-508
XD-542 Rework

Add DeploymentMetadata (based on @tekul DeploymentInfo)

Module constructor now takes a ModuleDefinition and DeploymentMetadata.
Merge branch 'XD-545-Display-Counter'
Fix ReferenceDoc unit test
Plugin Refactoring

Separate module context refresh() and start() to allow
post refresh/pre start configuration.
Set up channel registry in post processing