add experimental svg support
- supports nested svg elements
- supports svg attributes
- supports xlink
Merge branch 'next' into svg

Conflicts:
	archive/v0.1.2/mithril-tests.js
	archive/v0.1.2/mithril.min.js
	archive/v0.1.2/mithril.min.map
	archive/v0.1.2/mithril.min.zip
	mithril.js
	tests/mithril-tests.js
add docs for SVG, and better tests
add docs about github
add unminified file to zip