Parse out textualize integer config paramters as integers rather than doubles

`getConnectionString` currently makes all numbers in a Configurator.Config doubles; integers end up with .0 appended to them in the generated text.

Given a config file with

```
host = "database.at.my.host"
port = 5432
user = "myusername"
db = "thedbname"
```

the generated connection string is 

`"host='database.at.my.host' port=5432.0 dbname='thedbname' user='myusername' "`

If you use a .pgpass file, and in it you specify a port, ex:

`database.at.my.host:5432:thedbname:myusername:mypassword`

this parsing and generating the port as a double will kill the magic. 5432.0 doesn't match 5432, so you get an exception. `libpq: failed (fe_sendauth: no password supplied)`

Granted this can be solved by making the port a * wildcard in pgpass, but I may have other reasons for specifying the port there.

Looking at the denominator and parsing denominator=1 ratios as integers this way solves that problem - not sure if it screws with anything else though (options given as integers which for whatever reason must actually be presented as a double with .0? Seems unlikely.)

Other choice is adding integer support to configurator - dunno if that's something desired, anyways. The `interpolate` function in configurator does something similar to this, though.