Merge pull request #1 from vchollati/master

Added .md files for nyc2013 and sv2013 and video links
Add contributor
fixes year on PyData 2013 Silicon Valley
Merge pull request #2 from codersquid/patch-1

fixes year on PyData 2013 Silicon Valley
conferences: Rename Boston file to match others

The link was broken in the README, this will fix it (by following the 
same naming convention as the other files.
bos2013: Fix pydata.org URLs, add video links

This removes the extra ‘/‘ in the pydata.org urls and adds links to my
videos and slides.
Merge pull request #4 from mdbecker/master

conferences: Rename Boston file to match others
updated bos2013 nyc2013 and ldn 2014