Revised manual to be correct about short-circuiting

travis just doesn't support >10m builds anymore. Dropping torture ite…

…rations and removing other attempts.

Added 'unchecked' mode to expressions

Added test coverage badge

Added note about api breaks

removed duplicated test runs

Added vjeantet to contributors page, since regex parsing came directl…

…y from there

Added go 1.4 to travis builds

fmt

Added documentation for date parsing/evaluation.