Update Sparkour for Spark 2.4.0.

Spark 2.4.0 was released on Nov 2, 2018.

Recipes

Shared

• Update VERSIONS.txt.

• Regression test examples via SPARKOUR-30 automated output.

• Regression test examples manually (building-maven, building-sbt, submitting-applications).

• Regenerate ZIP examples.

sparkour-conventions

• No changes.

spark-nutshell

• Update years of experience.

installing-ec2

• Update download instructions.

• Update EC2 costs.

managing-clusters

• Update Spark version in log output.

submitting-applications

• Check on progress of linked Jira ticket.

• Update Spark version.

working-rdds

• No changes.

working-dataframes

• No changes.

using-sql-udf

• Check on progress of linked Jira ticket.

using-jdbc

• No changes.

controlling-schema

• No changes.

understanding-sparksession

• No changes.

building-maven

• Update Spark, Maven, plugin versions.

building-sbt

• Update Spark, SBT, assembly versions.

aggregating-accumulators

• Check on progress of linked Jira ticket.

broadcast-variables

• No changes.

spark-ec2

• Update Spark version.

configuring-s3

• Update S3 costs.

using-s3

• Check on progress of linked Jira ticket.

s3-vpc-endpoint

• No changes.

installing-zeppelin

• Rewrite for latest version of Zeppelin 0.8.

Website

Shared

• No changes.

license

• Update Spark version (2.4.0)

index

• Add News / atom.xml News.