Ignore local .vendor directory.
Update release to a version that exists in the datastax repo.
Optionally install java, update default java attributes & make yum more configurable.

* We've found the open source java cookbook to be a bit heavy for our needs, so this is a way to skip the java cookbook from running.
* By default the open source java cookbook will install java 1.6, which doesn't appear to be suitable for cassandra. Adding `java` attributes fixes this.
* For those who run their own yum repos & mirrors, it's convenient to override the creation of the yum repository.
Add cluster_name attribute so cookbook doesn't fail.
Update README with new attributes.
Patch version bump.
Add a comma.
Revert patch version bump.
Remove garbage characters.
Move cassandra yum attributes into datastax file, and add Java defaults.
Refactor attributes in .kitchen.yml
Merge pull request #101 from behanceops/feature-abstraction

Feature abstraction