Changes to haddock(3)

Changes to haddock:
commit 6ca276702d04c9183caa98d1848f6aa5b88a8755
Author: Niklas Haas <git@nand.wakku.to>
Date:   Sun Feb 23 16:11:22 2014 +0100

    Add RankNTypes test case to ImplicitParams.hs

    This test actually tests what #260 originally reported - I omitted the
    RankNTypes scenario from the original fix because I realized it's not
    relevant to the underlying issue and indeed, this renders as intended
    now. Still good to have more tests.

commit 64850ca4f7dc2ca0fdb21d078d93cd636de5c87a
Author: Niklas Haas <git@nand.wakku.to>
Date:   Sun Feb 23 15:37:13 2014 +0100

    Lower precedence of equality constraints

    This drops them to the new precedence pREC_CTX, which makes single
    eqaulity constraints show up as (a ~ b) => ty, in line with GHC's
    rendering. Additional tests added to make sure other type operators
    render as intended. Current behavior matches GHC

commit 14531f7838c5abd0ba2aaf5217a477194d7b1897
Author: Niklas Haas <git@nand.wakku.to>
Date:   Sun Feb 23 15:21:52 2014 +0100

    Make ImplicitParams render correctly (#260)

    This introduces a new precedence level for single contexts (because
    implicit param contexts always need parens around them, but other types
    of contexts don't necessarily, even when alone)