Merge pull request #11 from svenwin/master

README fixes
Fix syntax highlighting
Merge pull request #12 from danielbayerlein/master

Fix syntax highlighting
Change GoogleUniversalAnalyticsAdapter to make possible sending events in non-default trackers.
Fix 'white page returned' error - https://github.com/Nix-wie-weg/ga_events/issues/8
Add first few lines of spec for middleware
Merge pull request #14 from brain-geek/fix_empty_page_issue

Fix 'white page returned' error
Merge pull request #15 from brain-geek/add_spec_to_upstream

Add first few lines of spec for middleware
Merge pull request #13 from brain-geek/non_default_trackers

Make sending events to non-default trackers possible
#14524: Version bump and documentation