Merge branch 'release/2.1.0' into develop
[CS] JRuby is fixed but Travis' ruby-head is broken
[CS] Add benchmark for AGI environment parsing
[CS] Do a bunch less unescaping of AGI environment strings

Boosts performance (on MRI 2.0.0) by approx. 1.6x
Test on recent Ruby releases
[FEATURE] Provide timestamps of events as `#timestamp`, `#receipt_time` and `#best_time`
[CS] Better error when failing to parse AGI results
[DOC] Changelog entries
[UPDATE] Bump to 2.2.0
Updated rubies for CI

1.9.2 is no longer supported
Merge branch 'release/2.2.0'