Annotated errors + normalizing syntax-error properties

[mattdesl]

2 looks great with babelify, but still a bit sad with regular browserify, just showing "Unexpected Token" in the browser.

Looks like browserify/acorn uses syntax-error, which has err.annotated for pretty-printing. Further, it uses non-standard err.line and err.column.

This PR takes a stab at normalizing the result for babelify and regular old browserify. This way non-babelify users can get nice errors too:

[zertosh]

:+1:

[zertosh]

Thanks!

[zertosh]

Published as errorify@0.2.0