jquery.byteLimit: Improve unit tests

* Update outdated documentation
* Remove hasLimit and limit properties of the test helper
  function. These just repeated data already provided
  (hasLimit if input != output, limit == expected.length)
* Add tests for a filter that increases the length
  (currently only a decreasing filter was tested).

Change-Id: Ib4c19f4d49ed9d19117bbbaccedb0fccaeb34719
Merge "jquery.byteLimit: Improve unit tests"