rework testing code

* drop *phantomjs, which is not necessary
* proper requiring of dependencies
Merge branch 'gh-pages' of github.com:tyrasd/osmtogeojson into gh-pages
reorganize "interesting objects" test
add many unit tests

* more complex relation-membership example
* add test for ignored objects (e.g. overpass areas)
* add many "tainted data" tests
* including a failing test case with degenerate complex multipolygons