The leading 'x' is kind of arbitrary. Especially now that we can set
topics on the repositories, we don't need a pattern to distinguish what
is a track or not.

The repository itself has already been renamed. GitHub redirects from
the old name to the new name, so we do not have to rush to fix links to
the old repository name, though we should update them for the sake of
clarity.

Add policy for 'final' classes

run-length-encoding: estimate difficulty 5

Clean up root build script

Update Gradle wrapper to 4.0

kindergarten-garden: estimate difficulty 4

hello-world: explain @Ignore annotations

scrabble-score: update to v1.0.0 of tests

Add cross-referencing comments r.e. stripping ignores

Rename sut variable [Fix #621 #622 #623 #624]

journey test: pull in improvements from xkotlin

https://stackoverflow.com/questions/21612980/why-is-usr-bin-env-bash-superior-to-bin-bash

https://stackoverflow.com/questions/21612980/why-is-usr-bin-env-bash-superior-to-bin-bash

This makes it easier to compare the xjava and xkotlin Travis
configuration files.

Reference: https://stackoverflow.com/a/11651184/2911458

Parallelize unit tests

Delete ignored key from config.json

Since the exercise implementations are all in the exercises directory
we no longer need to ignore any non-exercise directories in the root
of the track.

Normalize format of config file

 This will let us script changes to it with less noise in the diffs.

See https://github.com/exercism/xkotlin/pull/61 for context.

isogram: add hint for german umlauts encoding

Rename the global exercise hints file

We've had some difficulty coming up with a good name for the file
that gets included in all of the exercise READMEs for a given track.

These are global hints, like how to run the test suite, which are
relevant to all the exercises on a track.

We started with SETUP.md in the root of the repository, then renamed
that to exercises/TRACK_HINTS.md because SETUP.md was misleading and
confusing, but then we realized that TRACK_HINTS.md was a bit ambiguous
and confusing as well.

Finally we settled on putting the file in the docs directory, since
this is user-facing documentation, and calling the file
EXERCISE_README_INSERT.md

See https://github.com/exercism/meta/issues/5 for context.

collatz-conjecture: update to latest tests

https://github.com/exercism/x-common/blob/c7c078dbe85e03bd90e6eb343e154f2d176175cc/exercises/collatz-conjecture/canonical-data.json

ocr-numbers: estimate difficulty, position

Use Gradle wrapper for CI jobs

word-search: add to track

saddle-points: API cleanup, ordering

clock: set estimated difficulty to 7