Make further changes
* Implement optional screenshot names
* Remove unnecessary function parameters (lots!)
* Set default screenshot directory
* Implement `kill_android_proc' (and `kill_android')
* Add some Android-related debugging information
* Remove (rename) {start,stop}_helper, since they were redundant
* Check if Android is up before trying to stop it
* Uses Netcat instead of SSH to check for SSH (Fixes #24)
* Make `--client-copy-file' support spaces (Fixes #23)
* Refactor `talk_to_user' to be more readable
Merge commit 'e45872f'

Conflicts:
	bin/tm-vmm.tmpl
	scripts/vmm-client-android-specific
	scripts/vmm-client-functions