Add travis-ci configuration

Builds on OpenJDK 7, OracleJDK 7 and OracleJDK 8
Merge pull request #51 from aslakknutsen/travis

Add travis-ci configuration
Make the travis.yml file hidden
fixed checkstyle
Merge pull request #52 from aslakknutsen/travis_fix

Make the travis.yml file hidden
Add travis build status image
Add TERM=dumb to travis config to get clean output from gradle
Attempt to turn parallel test execution off to avoid random test failure on CI
Remove travis ci gradle parallel override

Test failure has nothing to do with running in parallel
Add CountDownLatch and Exceptions List to feed information back to main thread

TestConsoleCallback function as a base class for ConsoleCallback in tests
that takes a CountDownLatch and List<Throwable>.

The TestConsoleCallback expose a verify method that can be used as a
replacement for execute in ConsoleCallback to verify the execution.

The TestConsoleCallback takes care of adding caught exceptions to the
exception list and call the CountDownLatch when done.

Waiting for the CoundDownLatch and re throw of Exceptions caught in the
TestConsoleCallback needs to be done in the Main thread executing the test
method so the errors are reported back to JUnit.
Update Console tests to use BaseConsoleTest.invokeTestConsole

invokeTestConsole handles:

* Creation of Pipes
* Creation of Console
* CountDownLatch setup
* Verification Exceptions

invokeTestConsole comes in 3 different varieties:

* Setup, Verify
* CallbackCount, Setup, Verify
* CallbackCount, Setup, Verify, SettingsBuilder

CallbackCount is the CoundDownLatch number to use. How many callbacks
should we wait for before moving on.
Merge pull request #53 from aslakknutsen/test_failure

Add CountDownLatch and Exceptions List to feed information back to main ...