Merge pull request #184 from wheaties/master

Update README.md
Added fold for Coproducts.
Added scaladoc; tidied.
Simplified HList.fill and Tuple.fill definitions
Merge pull request #185 from alexarchambault/master

Simplifying HList.fill and Tuple.fill definitions
Add tupled method to Sized

As discussed in #187.
Merge pull request #189 from ceedubs/sized-tupled

Add tupled method to Sized
Ignore scratch subproject.
Bumped Scala version to 2.11.2.