Remove use of call chaining

There is a pull-request landing in vector_math soon that removes call chaining from the library (and also comes with many dart2js related improvments).
The problems that my changes to vector_math introduce can be solved by using the .. operator.

This change also works without the pull requets in vector_math. But I'm not sure if I covered all required changes. The demos are working fine, but during testing the demo I noticed that the analyzer missed at leas one problem (http://dartbug.com/17680).