Removes dependency on ghc-syb that, according to Hackage, doesn't exist.
Merge pull request #284 from lostbean/master

Removes dependency on ghc-syb that, according to Hackage, doesn't exist.
Bump glob to 0.7.3
Bump heist to 0.13.0.3
Bump snap to 0.13.1.1
Bump diagrams-postscript to 1.0.0.1
Bump diagrams-core to 1.0.0.1
Bump diagrams-lib to 1.0.0.1
Loosen dlist dep in graphviz
Bump diagrams-contrib to 1.0.0.1