Added ETag for 304 responses. Second try...
Adding Metrics Counters to FeedPublishers for all Adapters
Merge pull request #228 from mattkovacs/master

Adding Metrics Counters to FeedPublishers for all Adapters
Merge pull request #225 from cartmanume/Branch_459667eca5aca525806302f7cc2c9604269526d2

Added ETag for 304 responses. Second try...
renaming counter from events to entries
Merge pull request #229 from mattkovacs/master

renaming counter from events to entries