SPARKC-476: SessionProxy Should proxy all Runtime Interfaces

Previously when a DataFrame was turned into an RDD by it's `rdd` method
saveToCassandra and joinWithCassandraTable would fail because of the
lack of an implicit RowWriterFactory. To fix this we add an implicit
for a RowWriterFactory for RDD[T <: Row] which ends up mapping to the
SqlRowWriterFactory which we already have written.

The CassandraRDDMock just passes through another RDD and pretends it is
a CassandraRDD.

SPARKC-466: Add a CassandraRDDMock for end users to use in Unit Testing

SPARKC-475: Add implicit RowWriterFactory for RDD[Row]

Fix doc links
Adds Python Dictionary as Kwargs Example
More examples, Common issues
Minor edits for consistency
Text and link edits

Refresh Documentation to Use Spark 2.X concepts

* SPARKC 492: Protect against Size Estimate Overflows

* SPARKC-491: add java.time classes support to converters and sparkSQL

* SPARKC-470: Allow Writes to Static Columnns and Partition Keys

Link to spark-connector Slack channel at DataStax Academy Slack

[DOCS][MINOR] Formatting

For some reason the logic for finding the module names was not working
(at least on my Mac). Here I simplify it by just iterating over the two
folders we know about, therefore making sure the output files exist in
their own separate folders.

B2.0

Fix Python package url

Detailed Java API user guide with code examples.

doc: markdown typo - best commit in history

Update Java API Documentation.

- minor restructure for the introduction sections
- extend copyright year
- fix a few external links for https
- drop IRC reference (no longer used)

Add support for LcalDate year only parsing