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