tns run/emulate/deploy does not check if device is available before build

[dtopuzov]

Steps to reproduce:
run/emulate/deploy on not existing device/emulator/simulator

Result:
tns execute prepare and build and after that check if device is available.

Suggestion:
When execute un/emulate/deploy check if device/emulator/simulator before prepare and build.

[vchimev]

Done for the run and deploy commands in 1.5.0.

If you execute tns emulate android --device xxxxx it starts the default emulator.
If you execute tns emulate ios --device xxxxx it prepares, builds and finally reports that Unable to find device xxxxx.

Closing this one and updating the relevant: #289.