PyYAML upgrade

Upgraded to use newest version of PyYAML

Video and IO error improvements

Script now handles old 90 seconds videos (hello 2008!), and continues on IO Errors instead of throwing an exception and stopping.

Video support and photos outside sets

Adds support for downloading videos (thx @hsuantien), and adds support for download all photos for a given set, no matter if it's in a set or not.

Fixes Windows console output

Now properly handles unicode characters on the standard Windows console (that can only handle ascii)

Adds better command line documentation

v0.2.12

improved help text a lot

Fix for path name separators in photo set titles

v0.2.11

bumps version to 0.2.11

Falls back to id when no title step 2

Now does it for all filename naming handlers

Falls back to id when no title

v0.2.8

fall back to id naming if title is empty

Escapes file paths in titles

Properly handles a photo with a title like "Something / Other" by replacing the / with a _

Download all sets for a user

Merge pull request #8 from beaufour/download_user

adds support for downloading all sets for a given user