Add there "exercises" key to config.json

First step in transitioning from "problems" to "exercises".

Part of exercism/xjava#125.

Fixed typo "but the tests are expects"

A (partial) fix for the issue #2670

Use same version of Ruby X-API is: now 2.2.5.

dibs: I will implement exercise beer-song

Merge journey test scripts into one.

CI runs journey test

- otherwise this journey is testing not the latest copy of xjava, but
  what's at origin/master.
- add progress indicator.
- x-api can't serve binaries; must clean xjava of any build artifacts
  (e.g. .class files) before attempting to serve.

Signed-off-by: Bronwyn Perry-Huston <bronhuston@gmail.com>
Signed-off-by: Cen Ge <cge@corelogic.com>
Signed-off-by: John Ryan <jtigger@infosysengr.com>

Signed-off-by: Cen Ge <cge@corelogic.com>
Signed-off-by: Dan Neumann <dan@bestangle.com>
Signed-off-by: John Ryan <jtigger@infosysengr.com>

- golang 1.4 networking libs favor IPv4; x-api listening on IPv6
  localhost.
- need golang 1.5+

Signed-off-by: Bronwyn Perry-Huston <bronhuston@gmail.com>
Signed-off-by: Cen Ge <cge@corelogic.com>
Signed-off-by: John Ryan <jtigger@infosysengr.com>

Signed-off-by: Cen Ge <cge@corelogic.com>
Signed-off-by: Dan Neumann <dan@bestangle.com>
Signed-off-by: John Ryan <jtigger@infosysengr.com>

- clone x-api
- use proper version of ruby.

Signed-off-by: Bronwyn Perry-Huston <bronhuston@gmail.com>
Signed-off-by: Cen Ge <cge@corelogic.com>
Signed-off-by: John Ryan <jtigger@infosysengr.com>

Add canonical cases to test

Fix typo in test name

As I don't think the month of Map exists, I'm guessing this is meant to be May :)

Modify README to clarify instructions

Uppercase oxyphenbutazone

Update ABOUT.md

made the changes in the file.

Add new exercise simple linked list

Fix issue with jarfile

Add Java learning resources

Add new exercise acronym

- closes #89

- fixed a couple typos too.

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.

Fix broken image on installation instructions

Polish example linked-list exercise

Add nth-prime exercise