Skeleton snippets for Google Test
Some further expectations snippets for gtest
Fixed a couple of typos, removed cruft

Removed the crappy, low-value autogenerated messages from the
expectations, not adding anything and just creates editing overhead
Added yasnippets for predicate expectations

Also generates indicative predicate implementation, commented as aide memoire
Merge branch 'feature/yasgtest' into develop
Merge branch 'release/3.0.0'