Add adb logcat data emitting
Add adb logcat data emitting

You can attach to adb logact by using
```
require("mobile-cli-lib").deviceEmitter.on("adbData", function(data) {
   // do something
});
```
Exposed events are:
* `adbData`
* `adbError` - when error occurs
* `adbClose` - when adb logcat finishes its tasks. Called with exit code, converted to string.

telerik/mobile-cli-lib,telerik/mobile-cli-lib