contravariant 1.1 and profunctors 4.2
Merge pull request #5 from silkapp/contravariant-profunctors

contravariant 1.1 and profunctors 4.2
contravariant 1.2.*
Merge pull request #6 from bergmark/patch-1

contravariant 1.2.*
Better TH error message
Boilerplate for 16 elements
Merge pull request #7 from silkapp/th-and-boilerplate

Better TH error message and 16 element boilerplate
boilerplate for 17 and 18 elements
Merge pull request #8 from dbp/master

boilerplate for 17 and 18 elements
Merge pull request #1 from karamaan/master

Merge karamaan