Extend MVC framework to have a better support for render and resource urls

{markdown}Just started reviewing <br><br> Sent from [GH](http://nodegh.io).{markdown}

Hey David,

It's an extension of the previously existing MVCPortlet, so yeah, it's backwards compatible. The only change that should be done to keep backwards compatibility is update the name of the property used. Before it was like

@Component(
immediate = true,
property = {
"action.command.name=view",
"javax.portlet.name=" + InvitationPortletKeys.INVITATION
},
service = ActionCommand.class
)

and now it will be:

@Component(
immediate = true,
property = {
"javax.portlet.name=" + InvitationPortletKeys.INVITATION,
"mvc.command.name=view"
},
service = MVCActionCommand.class
)

Finally, one other thing that is necessary to take in consideration is that the previous ActionCommands were valid for both ActionURL and ResourceURL. However, now we have to distinguish both ActionURL and ResourceURL as different action, so you can actually map both with the same key and it will work (not like before).

So, if people were using ActionCommand for resourceURLs now they will need to use MVCResourceCommand for them and instead of using the parameter ActionRequest.ACTION_NAME they will need to use resourceID in the resourceURL.