option: change None to singleton
build distribution in `dist/` folder
readme: fix typo
update package.json
use UMD when exporting monapt
redirect travis-ci icon in readme
take value, not function, in getOrElse/orElse
return value of match and throw PatternNotMatchedError if not found
bump grunt-contrib-uglify

to fix isses with travis-ci npm install
fix node versions in travis config
don't test node v0.8 for now
replace anonymous Error with monapt.MatchError
update readme with correct typescript syntax