Allow middleware to set http status code
Allow middleware to set http status code

This commit allows middleware to set the status code of the http response. This will allow a server-side router to return, for example, a '404 Not Found' response. This has SEO benefits because currently search engines may index example.org/page-that-doesn't-exist because Meteor returns a 200 OK code and the normal boilerplate response body. With a proper 404 status we can still return the boilerplate to render a client side 404 template but search engines won't index the page. Instead of a hardcoded 200 response, we call res.writeHead with res.statusCode, and fallback to the default 200 code if it has not been set.
jdivy/meteor,Hansoft/meteor,AnthonyAstige/meteor,nuvipannu/meteor,AnthonyAstige/meteor,4commerce-technologies-AG/meteor,mjmasn/meteor,lassombra/meteor,jdivy/meteor,meonkeys/meteor,DAB0mB/meteor,Urigo/meteor,jdivy/meteor,lassombra/meteor,meonkeys/meteor,4commerce-technologies-AG/meteor,Urigo/meteor,mjmasn/meteor,lassombra/meteor,AnthonyAstige/meteor,4commerce-technologies-AG/meteor,mjmasn/meteor,chasertech/meteor,nuvipannu/meteor,meonkeys/meteor,DAB0mB/meteor,DAB0mB/meteor,lorensr/meteor,Hansoft/meteor,mjmasn/meteor,DAB0mB/meteor,Urigo/meteor,meonkeys/meteor,Hansoft/meteor,AnthonyAstige/meteor,lorensr/meteor,lorensr/meteor,Hansoft/meteor,nuvipannu/meteor,DAB0mB/meteor,lorensr/meteor,jdivy/meteor,DAB0mB/meteor,lorensr/meteor,Hansoft/meteor,lassombra/meteor,lorensr/meteor,chasertech/meteor,chasertech/meteor,jdivy/meteor,AnthonyAstige/meteor,chasertech/meteor,4commerce-technologies-AG/meteor,DAB0mB/meteor,Urigo/meteor,mjmasn/meteor,Urigo/meteor,4commerce-technologies-AG/meteor,AnthonyAstige/meteor,chasertech/meteor,meonkeys/meteor,Hansoft/meteor,nuvipannu/meteor,nuvipannu/meteor,chasertech/meteor,mjmasn/meteor,Hansoft/meteor,jdivy/meteor,lorensr/meteor,4commerce-technologies-AG/meteor,Urigo/meteor,nuvipannu/meteor,lassombra/meteor,jdivy/meteor,meonkeys/meteor,meonkeys/meteor,nuvipannu/meteor,4commerce-technologies-AG/meteor,Urigo/meteor,AnthonyAstige/meteor,chasertech/meteor,lassombra/meteor,mjmasn/meteor,AnthonyAstige/meteor,lassombra/meteor