update for new node-postgres api change

fixed call problem.  have not fixed parse floats problem

Also, the tests were not running.  My old way of just inserting the
response from the shape_geojson_generation invocation isn't working
anymore.  don't know why, don't care.  The solution is to explitly call

as in

var shape_service_generator = require('shapes_postgis').shape_service
var ss = shape_service_generator({ options })

// then in express route

app.get('/points/:zoom/:column/:row.:format'
        ,function(req,res,next){ss(req,res,next)}
)

merely using

app.get('/points/:zoom/:column/:row.:format'
        ,ss
)

will fail silently, skipping on to the next route
Merge branch 'bug/postgres_api'

* bug/postgres_api:
  update for new node-postgres api change