Implements numerical key ranges; fixes #5
Refactor code to prepare for multiple keys per mapper support. Work in progress
Implement setting for number of mappers; completely rewrites CouchbaseViewInputFormat; fixes #6
Fix small issues; add a logger call; add another unit test
Fine tuning.
Merge branch 'feature/multiple-keys' into develop

Conflicts:
	pom.xml
v1.7.0