Start on more realistic and usable validation of info.
Finish up validation tests.
Add entries to changelog.
Ignore null/undefined values.
Merge pull request #79 from mapbox/better-validate

Better validate
5.1.0
Relax length limit on html-ey attributes.
Merge pull request #80 from mapbox/longer-html

Relax length limit on html-ey attributes.
5.1.1
Merge branch 'master' into serialize