Allow exceptions to propagate out of generator spies.
Merge pull request #55 from jmalloc/feature/generator-throw

Allow exceptions to propagate out of generator spies.
Updated to meet latest PHP CS fixer rules.
Updated changelog, readme.
Merge branch 'release/0.2.0' into develop
Updated test for HHVM nightly.
Generator spy verification returns all events, not just one per call. Relates to #54.
Dependency update, fixed coverage memory requirements.
Attempting to fix tests for latest HHVM.
CS fixer changes.