Fixes #192.

Navigator can now rotate together with the viewer.
Adds rotate event. Fixes #454.
use localName instead of tagName, to support dzi xml with namespaces
Cleanup.
Merge pull request #462 from rlskoeser/ns-aware

Support dzi xml with namespaces
Changelog for #462
Merge pull request #455 from PathXL/fixes-192

Fixes #192.
Changelog for #455
Merge branch 'master' into collections

fixed Conflicts:
	src/viewport.js