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
fixed issue around installation where app was downloaded and unzipped twice for the installApp mobile command.
Fix "Cannot read property of null/undefined".
Merge pull request #1026 from TadeasKriz/fix/undefined-this

Fix "Cannot read property of null/undefined".
Added fix to remove app/apk files from zipPath before appium starts to unzip them. If this is *.app located in Payload folder then folder is being removed too. Fix is done because fruitstrap sometimes failes to install app file on the device when /var/folders/... are not cleared correctly.
Merge pull request #1030 from tborys/remove_unziped_files

Remove *.app/*.apk/ file and Payload folder before appium starts to unzip file.
Merge pull request #1025 from snevesbarros/installApp_fix

Update and fix to installApp mobile command