fix($state): sanity-check state lookups

 - Fixes #980
chore(readme): added sample link
docs(readme): fix broken link to states
Merge pull request #996 from mrngoitall/master

docs(readme): fix broken link to states
Changes to top menu and resources

Originally refactored first menu to add FAQ, then got carried away
Added video section to resources
Merge pull request #1009 from jhr007/patch-1

Changes to top menu and resources
chore(changelog): update the changelog
feat($urlMatcherFactory): implement type support
fix($urlMatcherFactory): syntax
chore($urlMatcherFactory): clean up test defs
feat($urlMatcherFactory): date type support
feat($state): allow parameters to pass unharmed

[BREAK] This is a breaking change: state parameters are no longer automatically coerced to strings, and unspecified parameter values are now set to undefined rather than null.
feat($urlMatcherFactory): fail on bad parameters
feat($urlRouter): force URLs to have valid params
chore($state): validate rejection of bad params