More accurate description of `waitOn`

For #336
Merge branch 'dev'
Bumped connect version to deal with empty JSON responses.
Better detection of state change
Fixed typo: 'whever' to 'whenever'

FIRST PR. Thanks.
Briefly explain waitOn before it's properly explained
Fix typos and formatting in README
Fixed typo: 'that that' to 'that'

Second ever PR.
Logical quotes typo fix
Add a Concepts section explaining layouts and yields

Hope this section will help a first-time user get a good grasp of iron-router. Tested it on such a user and it worked :)
Typo fix, this hooks -> this hook
Fixed unbind on wrong element
Update README.md (filters are properties now)

The coffeescript examples appear to be out of date. You no longer call a class level method, but supply a property.
Mention waitOn usage in Router.configure
Merge pull request #415 from dandv/patch-6

Mention waitOn usage in Router.configure
Merge pull request #406 from RobertLowe/patch-1

Update README.md (filters are properties now)
Merge branch 'fix-IronLocation-unbindEvents' of https://github.com/txgruppi/iron-router into txgruppi-fix-IronLocation-unbindEvents
Update README.md (comments)

I just noticed the comments were out of sync since the merge.

Cheers
Merge branch 'patch-4' of https://github.com/dandv/iron-router into dandv-patch-4
Merge branch 'patch-2' of https://github.com/RobertLowe/iron-router into RobertLowe-patch-2