* added tests for filter.js, Added structure to test-directory
In the gulpfile I changed some of the karma execution to ensure templates.js exists before the tests
Also removed some StandardJS errors from filters.js
* added tests to create at least 50% coverage for filters.js
* Added test for full coverage of filters.js
* fixed 2 side-cases
* Removed duplicate test, improved test-titles and added outcome clarification for dateOrTimeFilter
* Added test-init
While running ``gulp test`` there were a lot of warnings concerning i18n: key not found
This was because init.js was not run.
Because some parts of init.js were not relevant, I created test-init.js, only containing the part concerning localization.
Now the log is a lot cleaner when running ``gulp test``
* added 'use strict' to testing files
* changed local vars to this.
* improved clarity of mistery numbers
* improved in-test structure
* Improved shortUrl tests
* removed unnecessary code
* added cleanup to single test
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