Refactoring for more error handling.
Error codes live in app/status.js now.
Merge pull request #30 from bernii/master

Python Unit Test
Merge pull request #31 from sourishkrout/master

Cleaner interfaces for error handling
Differentiate dev instructions from users
added getAttribute, clear, and active @sourishkrout please review clear (in ios.js) and active (as I had to modify appiumutils.js to make that work)
example python tests update