Commented out copysign.
Haskell copysign that passes tests (relies on unspecified behavior).

To pass the D5 and F5 tests with NaNs the `significand` is used to
determine the sign of `y`, which on my setup (GHC 7.8.3 on Mac OS X)
appears to work well when `isNaN y` = NaN. However, per the Prelude
docs the behaviour of `significand` is unspecified on NaN values, so
the apparent success may be particular to my setup or the specific
test cases.
Inline copySign.
Avoid unspecified behaviour for infinite values.
README
Rename ieee754-nolibm.
Documentation edits/additions.
README.md.
Add links to README.
Remove gratuitious emphases.
Spelling fixes.