Correct minor formatting issues

mixed 2/4 spaces -> 4 spaces

3 spaces -> 4 spaces

Mixed tabs and spaces -> spaces

Javaeeeee

minesweeper: add to track

queen-attack: add to track

* largest-series-product: add to track

* Add note to largest-series-product tests about JUnit Rules

* remove Guava and use JUnit assert

* reassign old to Collection.unmodifiable

* reassign variable expected

Fix minor typo

Remove duplicate "the"

Standardize on JUnit 4.12

difference-of-squares: add to track

Journey builds trackler

Fix spacing around punctuation.
Expand out acronyms first and add contraction in parens.
Adjust list of built-ins.

Replace JodaTime in Meetup with standard lib

Remove duplicated lines

Track data has been factored into a separate gem: trackler.  The build
was breaking.
  (see also exercism/x-api#141)

Nice work! @jtigger

- ensure titles of tests match those in
  https://github.com/exercism/x-common/blob/master/exercises/pangram/canonical-data.json

Update ABOUT.md

Add quick start guide

Ignore all but first test in hello-world

- 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.