REBASE bump targetSdkVersion to latest (20)
set up cachewordlib's manifest for merging, introduced in ADT v20

As of ADT v10 and gradle v0.10, it is possible to put stuff into a library
project's manifest, then have it included into the main project's manifest.
The main project has to add this to its project.properties to enable it:

  manifestmerger.enabled=true

https://android.googlesource.com/platform/sdk/+/a35f8af9eca38249b5c37391d7a7ae56c53251ad/manifmerger/src/com/android/manifmerger/ManifestMerger.java
https://stackoverflow.com/questions/10976635/using-the-new-manifestmerger-property-in-android/11234525#11234525
https://stackoverflow.com/questions/20346237/how-to-use-androidmanifest-merger