added examples in Matrix4.js
added some more examples and rephrased explanations
Merge branch 'master' of github.com:AnalyticalGraphicsInc/cesium into examples
made correction in getRotation example
made correction in getRotation example
Merge branch 'master' of github.com:AnalyticalGraphicsInc/cesium into examples
mistakes in examples corrected
Merge branch 'master' of github.com:AnalyticalGraphicsInc/cesium into examples
Merge pull request #724 from nobelium/examples

Added examples in Matrix4.js for #651