Create release notes for 0.8.0.dev0.
Create release notes for 0.8.0.dev0.

jsirois/pex,sixninetynine/pex,jamesbroadhead/pex,pombredanne/pex,pantsbuild/pex,kwlzn/pex,jsirois/pex,rouge8/pex,URXtech/pex,kwlzn/pex,rouge8/pex,mzdanieltest/pex,pantsbuild/pex,URXtech/pex,snyaggarwal/pex,pombredanne/pex,jamesbroadhead/pex,snyaggarwal/pex,mzdanieltest/pex,sixninetynine/pex