set the X-Powered-By header in HTTP responses

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
Merge remote-tracking branch 'github/master' into feature/powered_by
typo
Merge pull request #631 from vinbarnes/patch-1

typo
prepend X-Powered-By with "hubot/"

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
Fix example scripts

there is no `msg.respond`, only `msg.reply`
Merge pull request #628 from zvelo/feature/powered_by

Set the X-Powered-By Header in HTTP Responses
Merge pull request #632 from spajus/patch-1

Fix example scripts
Add missing colon
Merge pull request #633 from spajus/patch-1

Add missing colon
Fix broken link in docs/README.md

The url without protocol links to the following:
* https://github.com/github/hubot/blob/master/docs/nodejs.org/
Merge pull request #634 from tricknotes/fix-broken-link-in-docs-readme

Fix broken link in docs/README.md
Merge remote-tracking branch 'github/master' into feature/hub_verify

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>

Conflicts:
	src/robot.coffee