Make MANIFEST.in fully explicit.
Add missing MANIFEST.in entry for traits/protocols/README.txt.
Merge pull request #182 from enthought/exhaustive-manifest

Add an exhastive MANIFEST.in
Merge branch 'release/4.5.0' into merge-4.5.0
Merge pull request #185 from enthought/merge-4.5.0

Merge 4.5.0