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
cleanup
new style of returning responses, test methods for getAttribute, clear, and active, fix for active in appiumutils, return empty string if UIATextField has no value
Merge pull request #32 from bernii/master

Updated appium to make python example work