Add suppoort for Instant Run

[letientai299]

Hi @promeG,

I really appreciate your awesome work. XLog is very flexible to use.

I have one feature request. With the new Instant Run in Android Studio 2.0, the changes related to XLog are not affect to the app (add or remove methods to log, change time threshold...).
Could you please make this as an enhancement?

Once again, thank you.