uses cached reference to document.write form initialization time, adds test that overwrites document.write.
Tweak Jazzcat.combo.exec tests to better test the condition.
Bump release scripts.
Merge branch 'v2.0' into v2.0-jazzcat-document-write-ref

Conflicts:
	build/mobify-2.0.0alpha3.min.js
	tests/jazzcat.html
Merge pull request #152 from mobify/v2.0-jazzcat-document-write-ref

Works when other scripts override document.write
Merge branch 'v2.0' into v2.0-nonbreaking-jazzcat

Conflicts:
	build/mobify-2.0.0alpha3.js
	build/mobify-2.0.0alpha3.min.js