Add railway=funicular to roads layer

[nvkelso]

Example:

• http://www.openstreetmap.org/way/393550019

/cc @burritojustice

[rmarianski]

In the prs, I just piggybacked on top of the other railway rules for the kind and sort_key calculations. Here are the properties that came back for the example feature:

{
"sort_key": ​380,
"source": "openstreetmap",
"kind": "rail",
"railway": "funicular",
"id": ​393550019
}

[nvkelso]

WFM

[nvkelso]

Verified: