Add 2014-05-02 Tech Talk details.

Talk by Eric Hanson from Aquameta on using PostgreSQL and Git to build a
P2P data network.
Merge pull request #48 from finchd/2014-05-02-details

Add 2014-05-02 Tech Talk details.
Added Yelp talk by Fred Hatfull on May 7th
Merge pull request #49 from cameronbwhite/master

Added Yelp talk by Fred Hatfull on May 7th
Added Git Talk/Workshop by Emily Dunham May 16th
Merge pull request #50 from cameronbwhite/master

Added Git Talk/Workshop by Emily Dunham May 16th
Add link to sages blog
Merge pull request #51 from nightfly19/sage_blog_link

Add link to sages blog