Karma config

[Swiip]

This changes has started as an answer of #481. An impact after another, several things has been done.

• Change the configuration model, there is now a gulp\conf.js which contains the conf. It ables to read conf values from outsides of gulp (especially karma) and remove complexity of exporting a function in all gulp files.
• Remove TypeScript sortOutput.json and simply concat files in the build
• Add karma-angular-filesort to make karma able to sort angular files
• Remove gulp/unit-tests.js list files complexity, no more needs of gulp to sort files for karma
• Add list files computation in karma.conf.js in order to make it works outside of gulp (karma start should work out of the box now), fix WebStorm karma config problems #481, fix although unit test is setup the test suite is empty... #473
• Remove path computation with + for path.join, fix Use path.join instead of concatenating paths. #487
• Added some comments in gulpfile.js and gulp/conf.js