Add decode test case with description - decode all the letters

* Added format string to @Parameters annotation in and (to make them more descriptive) changed names of variables and tests in:
  * AtbashTest,
  * BinaryTest,
  * OctalTest,
  * PigLatinTest,
  * RaindropsTest,
  * RomanNumeralsTest,
  * ScrabbleScoreTest.
* Removed repeated word in format string for PiglatinTest and ScrabbleScoreTest.

Fixes #160.
Fixes #161.
Fixes #162.
Fixes #163.
Fixes #164.
Fixes #165.
Fixes #166.

- in journey test, remove @Ignores so that test runs exercise all tests.
- increase the verbosity of test logging to aide in seeing progress as
  tests are un@Ignored and solved.
- saving scripts used to make changes to all exercises.  These are the
  start of a library of scripts making such changes easier.
- make Gradle output more CI-friendly.

With exercism/exercism.io@54e1df3, we can now gather exercises into a
subdirectory. By separating the language track files from the
configuration and management files, it is easier to read the project.

- move gradle config under "exercises" too as it would make a mess
  otherwise.