Update README.md

Added http install instructions for express3, when behind a firewall.
OpenID sendToAuthenticationUri lacks promise 

 Openid module sendToAuthenticationUri step did not provide correct Promise object reference to use inside this.relyingParty.authenticate callback function. Also call back function did not fulfill promise(caused timeout error) and step itself did not return promise reference (caused uncaught exception).
Fix dynamic scoping caching issue
Merge pull request #380 from kyriesent/patch-1

Fix for Issue 250: Dynamic scoping caching issue
Merge pull request #379 from genuisereal/patch-2

OpenID sendToAuthenticationUri lacks promise
Merge pull request #371 from c0bra/patch-1

Update README.md
Merge pull request #1 from bnoguchi/master

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