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
optimize env parser
optimize lexer
typo, add space before =
Merge branch 'develop'
Merge branch 'optimize_lexer'
Merge branch 'optimize_env_parser'