use the new CBL project structure

- Maven artifacts have been renamed

- Source code dependencies are now expeced to be in a "libraries"
  directory
update readme with new submodule instructions
Merge pull request #2 from mjq/new_project_layout

Minimal changes to make CBL-Ektorp work with new project structure
add java-core submodule
add gradle wrapper
ignore .gradle file
add settings.gradle
add more things to .gitignore
remove dependency on couchbase-lite-android
add submodule for couchbase-lite-android
change artifact version to use hardcoded version rather than UPLOAD_VERSION_CBLITE (needs to be fixed, or at least re-named)
re-add dependency on ':libraries:couchbase-lite-android' submodule
add example local.properties file
Tests now compile
update submodules
Update to new Manager constructor method

https://groups.google.com/forum/#!topic/mobile-couchbase/6ZDOWHV4Hf8
Issue #3 - attempt to reproduce, did not see any issues.

https://github.com/couchbaselabs/couchbase-lite-android-ektorp/issues/3
Issue #3 - able to reproduce now

https://github.com/couchbaselabs/couchbase-lite-android-ektorp/issues/3
Issue #3 - modify assertion

https://github.com/couchbaselabs/couchbase-lite-android-ektorp/issues/3
update submodules