readme update related to issue #259
Merge pull request #290 from marturion/patch-1

readme update related to issue #259
Update README.md

Fix typo
Merge pull request #326 from thebrettd/master

Update README.md
Create CONTRIBUTING.md
Remove references to non-reactive routes.
Whoops
pathFor fix for optional segments. See #338

Conflicts:
	test/route.js
Return null on invalid resolves.
More tests for optional segments.
Reordering tests.
Alternative approach to empty optional segments.

We use this if we want for /:paramOne?/:paramTwo? to resolve to
/b if only paramTwo == b is specified, and not //b.
More tests.
More tests for mixed optional segments.
Merge branch 'master' into dev
Merge branch 'fix-issue-338-take2' of https://github.com/mitar/iron-router into mitar-fix-issue-338-take2