some readme updates, add m2repository in sdk
0.7.2: enable incremental resource-merging
0.7.2 is not ready, ignore previous commits

disabled incremental merging
gradle libs should be in src/main/libs
0.7.2: handle provided libs better

add a copy of classpaths in Android, bypasses the need to manually filter
out provided libraries
remove the use of build state from typedResourcesGenerator
add proguard.txt to aar builder
reduce the use of managedClasspath, dependencyClasspath and unmanagedJars
into just dependencyClasspath, it contains all of the former