Release v3.4

Removed offending sample op modes (SensorAdafruitIMU.java and SensorA…

…dafruitIMUCalibration.java) from project.

v3.0 includes changes for enhanced USB comm resiliency. It also intro…

…duces support for the REV Robotics Expansion Hub.

v2.4 officially released on 12/19/16.

fixed typo... "2.31" corrected to "2.35".

added javadoc

disabled debuggable mode for release version of the FTC Robot Control…

…ler app.

support for Android studio 2.1.x and updated README file.

changes made to support Android Studio 2.1.x