NarrativeScience/snakegit — pull request #64 by jdrake (2013-04-12 15:21:45+00:00)
Title: Upgrade a package in requirements.txt to its latest version.

@NicholasDAllen @mtrahan

e.g. to update pequod_proxy to use latest ns_ahab:
```
cd pequod_proxy
git snake bump_dep -r ns_ahab -p ahab ns_ahab
```