[SPARK-1566] consolidate programming guide, and general doc updates
This is a fairly large PR to clean up and update the docs for 1.0. The major
changes are:
* A unified programming guide for all languages replaces language-specific ones
and shows language-specific info in tabs
* New
[SPARK-1566] consolidate programming guide, and general doc updates
This is a fairly large PR to clean up and update the docs for 1.0. The major
changes are:
* A unified programming guide for all languages replaces language-specific ones
and shows language-specific info in tabs
* New
