Prep for the 1.3.0 release
Bump version to 1.3.0
Minor fixes to v1.3.0 release post.
Fix release date of v1.3.0 in History file
Fix link to /docs/datafiles/ in 1.3.0 release post.
Merge pull request #1694 from mojombo/release-1.3.0

Release 1.3.0