Update collator jni libraries

Rebuilt collator jni libraries with the latest ndk tool (android-ndk-r10d) that supports arm64 and more other more architectures. The change hasn't been tested with arm64-v8a as there is no such emulator provided by Google at this point. #469
Merge pull request #472 from couchbase/feature/issue_469_nexus9

Update collator jni libraries