Fix Ruby sample code so it works on Sauce Labs

Add Android cucumber example

Fix #1458
translate the new added docs
Fix error handling in installApp
Merge pull request #2724 from testerhome/master

translate the new added docs and modify ios_simple.py
Merge pull request #2727 from bootstraponline/ruby_sample

Fix Ruby sample code so it works on Sauce Labs
Merge pull request #2729 from imurchie/isaac-installapp

Fix error handling in installApp
extracted appium-adb npm package
extracted appium-adb npm package
extracted appium-adb npm package