Added support for registering appium server to the selenium grid
Fixed travis errors
Updated code based on review comments
Used 'request' instead of 'http'
Removed 'code'
Updated 'https' to 'http'
removed unnecessary callback
added return statement
added single spaces around operators
corrected indentation
Added "wait for page load" support for android
Merge pull request #601 from swapna-chennadi/master

Functionality to register appium with the selenium grid
Merge pull request #619 from mutualmobile/wait_for_page_load_android

Added "wait for page load" support for android
Add native back for iOS
Merge pull request #622 from bootstraponline/ios_back

Add native back for iOS