Programmatically upload bokeh js/css to the container

This PR add a simple and isolated script to upload bokeh.[min].js[css] files to Rackspace.
This helps in the release process and BEP-2 has to be modified accordingly after merging.

Nop... the url scheme its ok... bokeh is the name of the container... and then you can make folders and they will be added to the resulting url.
I have made a release folder inside the bokeh container and with:
```
curl -XPUT -T ../bokehjs/build/js/bokeh.js -v -H "X-Auth-Token:$token" -H "Content-Type: text/plain" \
"https://storage101.dfw1.clouddrive.com/v1/$id/bokeh/release/bokeh.$tag.js";
```
I get the current working url: http://cdn.pydata.org/release/bokeh.0.X.0.js