Bespin integrated in Futon views editor

Here is the "less-intrusive-I-can" patch to enable bespin editor in Futon database views page.

Implementation constraints :

• bespin can't have multiple instances
• bespin can't be enabled=>disabled=>enabled

I also met a bug on Google Chrome because CouchDB doesn't set a charset in HTTP response headers for database.html ... As a result I only succeded with BespinEmbedded 0.7.1.

Implementation details :

• created proxy functions to get and set map/reduce code to/from editor ( instead of $("#viewcode_map").val() ... )
• created bespin wrapper class