created hack dirs

created the directories and started readme files for the 140730
YastroML Hack session
Merge remote-tracking branch 'upstream/master'
ignore ._* files
added SF data

added the pickles containing radial velocities for two young clusters.
added SF readme

added a readme that shows how to load in the SF cluster RVs
Merge pull request #23 from mattgiguere/master

created hack dirs