Handle emitted string error messages.
Merge pull request #58 from shuhei/string-error

Handle emitted string error messages.
Update README.md
core: minor improvements
core: change default assignation
core: tidy - 80 cols
core: pass opts object to browserify constructor
core: add custom nobuiltins options
doc: add nobuiltins option decomentation
Merge pull request #63 from cloudup/master

Add options nobuiltins
0.5.0