move plot tester into tests folder

All tests and examples belong in the test folder

	renamed:    ../test.html -> tester.html
fix formatting and style in tester

Code should contain no whitespace and tabs or use single quotes.

	modified:   tester.html
Fix Gruntfile and remove karma dependency

The project doesn't have a dependency on karma so the require has been
removed.

	modified:   Gruntfile.js
	modified:   package.json