Support --incremental on dex
[travis-ci] Download, install and use Maven 3.1.1

There is no reason for red build while waiting for Travis CI team to
make Maven 3.1.1 available out of the box.

Signed-off-by: Mykola Nikishov <mn@mn.com.ua>
Merge pull request #237 from manandbytes/travis-mvn311

[travis-ci] Download, install and use Maven 3.1.1
Use SdkConstants for classes.jar
Updated to builder 0.6.1
Create the R.java for aar libs
Merge pull request #238 from Shusshu/issue-constants2

Use SdkConstants for classes.jar
Merge pull request #239 from Shusshu/builder061

Updated to builder 0.6.1
Merge pull request #240 from Shusshu/aar-create-r-java

Create the R.java for aar libs
Merge pull request #236 from tuenti/incremental-dexing

Support --incremental on dex
upgraded to 0.6.2 of builder library
extended instrumentation goal to allow for additional user defined instrumentation arguments