Update android/src/com/google/android/testing/nativedriver/server/ServerInstrumentation.java

Adding HealthStatusServlet
Create HealthStatusServlet.java

Adding HealthStatusServlet.java
Update android/src/com/google/android/testing/nativedriver/server/HealthStatusServlet.java
Update android/src/com/google/android/testing/nativedriver/server/ServerInstrumentation.java

Re-order handlers so healthstatus comes first for /wd/hub requests.
Merge pull request #3 from tokunbo/master

Adding support for SeleniumGrid2 Android