Support If-Match header with HTTP requests which do not provide a resource such as DELETE commands.
Change to only apply E-tags to entity resource responses. If-Match HTTP request headers will be set on the interaction context instead.
Merge branch 'master' into xtext2.4-dev
Re-enabled the UpdateResourceITCase tests after merging in the fix.
Allow RIM resource elements to be defined in any order.
Improve the RIM grammar; is related to issue #55.  This change defines a uniform syntax for collection block including actions, relations, and command properties.  The 'view { Command }' syntax has also been brought in line with the element syntax i.e. now 'view: Command'