Operator: Publish and PublishLast

[benjchristensen]

http://msdn.microsoft.com/en-us/library/hh229126(v=vs.103).aspx
http://msdn.microsoft.com/en-us/library/hh211622(v=vs.103).aspx
http://msdn.microsoft.com/en-us/library/hh229147(v=vs.103).aspx
http://msdn.microsoft.com/en-us/library/hh229797(v=vs.103).aspx
http://msdn.microsoft.com/en-us/library/hh228989(v=vs.103).aspx
http://msdn.microsoft.com/en-us/library/hh211697(v=vs.103).aspx

[benjchristensen]

Good intro here: http://northhorizon.net/2011/sharing-in-rx/

[mttkay]

Thanks for linking that article, very helpful.

[benjchristensen]

Still missing publishLast

[johnhmarks]

This can be closed now as #407 included publishLast