- replaced jQuery with vanilla javascript
 - updated viewportHeight and documentHeight calculation methods
 - calculating top and bottom relative to document
 - using cached scrollTop value if possible
 - fallback to attachEvent for older IE versions
Merge branch 'master' of https://github.com/theorm/scrollMonitor into remove-jquery

Conflicts:
	package.json
start of unit tests
Merge branch 'master' into remove-jquery

Conflicts:
	demos/stress.html
added many more tests
more tests
tests are complete
got all tests working in testling