Only scan files from apps and packages that depend on famono.

Fixes #12.
Make all formatting the same.
Only scan packages in .meteor/packages
Changes for PR review and some readme improvements.
Remove duplicate code. Replace _.each with forEach.
Remove underscore dependency. Remove duplicate package checking code.
Refactor getPackages -> eachPackage to be consistent with eachFile.
Merge pull request #22 from jperl/packages

Only scan files from apps and packages that depend on famono