Allow people to use a different compiler than the default.
Demote shift and rotate to pure Copperhead functions.
Fix toolchain bug when cuda not present.
Merge branch 'master' of github.com:BryanCatanzaro/copperhead
Synchronizing.
Merge branch 'master' of github.com:BryanCatanzaro/copperhead
Documenting.
Changes to work with Boost 1.53 and Thrust 1.7.
Add enumerate to prelude.