Add: Flag to specify Port

[Zebiano]

There have been some instances where for example Bluestacks does not get recognized because of the adb port changing. To make it easier for users to change the port on the fly, a flag -p should be implemented to specify it. For example:

./deploy.sh -p 5554

This should try to connect adb on port 5554, like so:

adb connect localhost:5554