Merge pull request #419 from couchbase/feature/perf_automation2

Add three new test cases
Fix compile error

Introduced in https://github.com/couchbase/couchbase-lite-android/commit/84b5842e0ffdd55b76452a0245452fd0e6f28608#diff-1

The exception type in the method signature of runOne() was changed.
Add instructions on how to download latest version
Update README.md
Exploratory coding: mConnectionPtr is long instead of int

This isn't a workable long term solution.  Just experimentation at this phase.

https://github.com/couchbase/couchbase-lite-android/issues/373
Exploratory coding: mConnectionPtr is long instead of int

This isn't a workable long term solution.  Just experimentation at this phase.

https://github.com/couchbase/couchbase-lite-android/issues/373
Try to load mConnectionPtr as long, fallback to int

https://github.com/couchbase/couchbase-lite-android/issues/373
Remove logging

https://github.com/couchbase/couchbase-lite-android/issues/373
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Merge branch 'feature/issue_373_L_DevPreview'