Merge pull request #2589 from sebv/master

Adding remaining android test, moved android-webview to common
Don't send the JSON response as Error in getJSONFromUrl().
Allow String keycode
Merge pull request #2592 from appium/isaac-keycode

Allow String keycode
Merge pull request #2590 from paymand/contexts_fix

Don't send the JSON response as Error in getJSONFromUrl().
enabling selendroid ci tests
enabling selendroid ci tests