Make the CLI more "Unixy"

Switches the option parser to
[visionmedia/commander.js](https://npmjs.org/package/commander)
from nomnom to fix #67, #68.
Merge pull request #70 from zaach/unixy-cli

Make the CLI more "Unixy"
Update contributor list and sort by alphabet on surnames
Fix JSHint and existing lint errors
Failing test for #71
Fix #71, join multiple attribute expressions with ;
Merge pull request #72 from clkao/jade-second-attribute

Fix jade element with multiple gettext attributes
Fix --output-dir
Merge pull request #73 from clkao/output-dir

Fix --output-dir
0.5.1