Diana/update req

When trying to deply the hotfix branch to dev got this error:
```
[ 20140605 14:24:07 ] : [http://dev-edxapp-001.m.edx.org:22] out: Obtaining pymongo from git+https://github.com/edx/mongo-python-driver.git@dd01bf051dd5373146f668b9c78da9... (from -r requirements/edx/github.txt (line 20))
[ 20140605 14:24:07 ] : [http://dev-edxapp-001.m.edx.org
:22] out:  Updating /opt/edx/src/pymongo clone (to dd01bf051dd5373146f668b9c78da9cb15c82331)
[ 20140605 14:24:07 ] : [http://dev-edxapp-001.m.edx.org:22] out:  Could not find a tag or branch 'dd01bf051dd5373146f668b9c78da9cb15c82331', assuming commit.
[ 20140605 14:24:07 ] : [http://dev-edxapp-001.m.edx.org:22] out: fatal: Could not parse object 'dd01bf051dd5373146f668b9c78da9cb15c82331'.
[ 20140605 14:24:07 ] : [http://dev-edxapp-001.m.edx.org:22] out:  Complete output from command /usr/bin/git reset --hard -q dd01bf051dd5373146f668b9c78da9cb15c82331:
```

When trying to deploy this fix to sandbox succeeded with

```
Installing extra requirements: 'egg'\n
Obtaining pymongo from git+https://github.com/edx/mongo-python-driver.git@1882623fcf1689fe4e7ca621a49dbb57f90f5a04#egg=pymongo (from -r /edx/app/edxapp/edx-platform/requirements/edx/github.txt (line 20))\n  
Cloning https://github.com/edx/mongo-python-driver.git (to 1882623fcf1689fe4e7ca621a49dbb57f90f5a04) to /edx/app/edxapp/venvs/edxapp/src/pymongo\n
Could not find a tag or branch '1882623fcf1689fe4e7ca621a49dbb57f90f5a04', assuming commit.\n  
Running setup.py (path:/edx/app/edxapp/venvs/edxapp/src/pymongo/setup.py) egg_info for package pymongo\n   
```