$1 and $N recognizers #29

While working on #28, I've come across two research projects:

• $1 Unistroke Recognizer
• $N Multistroke Recognizer

What do you think about porting those algorithms to Android-friendly Java code and ship as a part of mapbox-gestures-android library, instead of naive implementation found in #28?
Both of those research projects are held under BSD license and are nowhere to be found when it comes to Android.

/cc @zugaldia @tobrun