Allow multiple instances with different setup#4

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shimaore wants to merge 4 commits intopublicclass:masterfrom

shimaore:master

Commits on Jun 25, 2012

Made `register` bound to a specific Express instance.
shimaore
committed
Added test with concurrent Express 3.x processes with different partial options.
shimaore
committed

Commits on Jul 29, 2012

Merge branch 'master' of git://github.com/publicclass/express-partials
shimaore
committed

Commits on Sep 19, 2012

Merge branch 'master' of git://github.com/publicclass/express-partials
shimaore
committed