add test and fix for isAppInstalled, updated selendroid test app location
Merge pull request #1018 from jlipps/master

fix isAppInstalled
Dynamic strategy now benifits from the classmap aliases.
Merge pull request #1020 from mutualmobile/master

Dynamic strategy now benifits from the classmap aliases.
mobile: localScreenshot
Merge pull request #1016 from bootstraponline/mobile_proxy

mobile: localScreenshot
Fix "Cannot read property of null/undefined".
Merge pull request #1026 from TadeasKriz/fix/undefined-this

Fix "Cannot read property of null/undefined".