test for vast without ads
small fixes
proper tests
adds top-level error, close #18
- updates specs based on pr
- adds information on why the xsd is `notOk`
- implements unit tests in main index file
bumps package version based on bug fixes
adds README from PR #18
bumps package with proper readme
Merge remote-tracking branch 'upstream/master'

Conflicts:
	index.js
	test/index.test.js