Removing unused code

* Removed LastModifiedShouldChangeAfterAPutRequest. Fixes #91
* Removed CondenseResponse - this has been pushed lower down the CI stack. Fixes #89
Moved riakLinks.Last() call outside of foreach to prevent multiple calls to .Last().
Fixes #90
Add assert for riak link count
Merge branch 'feature/LinkWalkingWithEfficiency' into develop
Merge branch 'feature/RemoveCondenseResults' into develop
Updated release notes to include issue fixes for JP's work