adding 2.3.0 release notes
adding known issue about F19 environment groups
1004580 - Add the ability to specify the checksum type when uploading rpm & srpm units
Fix PEP 8 blank line
rename summtype to sumtype
Merge pull request #401 from pulp/barnabycourt-1004580

1004580 - add ability to specify checksum type when uploading RPM & SRPM
reset back to 2.3.0-0.29.beta
Merge pull request #399 from pulp/mhrivnak-23releasenotes

adding 2.3.0 release notes
Merge pulp-2.3 => master, pre-build
Automatic commit of package [pulp-rpm] release [2.3.0-1].
Merge (-s ours) pulp-2.3 => master, post-build
Merge branch 'master' into jconnor-new-yum-distributor