Feature/experimental module

[vavison]

Description

Introduces a new module, waimak-experimental, containing experimental features for which the APIs may change.

Adds to this new module functionality for running multiple Spark applications within a single main method whilst obeying configured dependency constraints. As part of this, two traits, SparkApp and its child WaimakApp provide a framework for writing Spark/Waimak applications in which the user need only implement the application logic and define the application's environment and configuration, with everything else taken care of.

Fixes #52

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Unit tests for all new functionality

[coveralls]

Pull Request Test Coverage Report for Build 490

• 59 of 67 (88.06%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 80.051%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
waimak-experimental/src/main/scala/com/coxautodata/waimak/spark/app/EnvironmentManager.scala	6	8	75.0%
waimak-experimental/src/main/scala/com/coxautodata/waimak/spark/app/MultiAppRunner.scala	15	17	88.24%
waimak-experimental/src/main/scala/com/coxautodata/waimak/spark/app/Env.scala	23	27	85.19%
<!--	Total:	59	67	88.06%	-->

Totals
Change from base Build 484:	0.3%
Covered Lines:	1244
Relevant Lines:	1554

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💛 - Coveralls