Add *.swp to .gitignore
Merge pull request #111 from koichik/fix-multi-models

Better support for multiple models/collections
Support custom idAttribute in BaseView#getAttributes()
0.5.0-alpha02
Handle status code 204 properly

An API server may return "204 No Content" for PUT or DELETE request,
but apiProxy ignores it and returns "200 OK" on the server side.
Then, on the client side, jQuery detects "parseerror" because the
response has no body.

This patch makes apiProxy handling status code 204 properly.