Fallback sql view

[tleekkul]

fostgres.sql view should be able to set the fallback view when no path is matched.

Example

 {
 "view": "fostgres.sql",
 "configuration": {
 "sql": [{
 "return": "object",
 "path": [1],
 "GET": "SELECT * FROM user WHERE user=$1"
 }],
 "fallback": {
 "view": "fost.response.302",
 "configuration": {"location": "some-views"}
 }
 }
 }