Add working print button

[amyleew]

Adding print functionality #10, barebones elements added and semi-functional...

Run locally, clicking print button provides link in console and link populates with correct route query string. Needs:

• Pass correct viewOptions for center, zoom and loc values
• Populate route instructions
• Style route instructions

/cc @aaronlidman @TheMarex

[amyleew]

Stuck on this Uncaught TypeError: Cannot set property 'osrm' of undefined doesn't seem to be calling L.Routing.osrm properly @tristen

Calling a build and build-print script since i don't want to place the controls the same on the print page https://github.com/amyleew/osrm-frontend/blob/add-print/package.json#L8-L9

Do I need to call L.Routing.OSRM() differently here https://github.com/amyleew/osrm-frontend/blob/add-print/printing.js#L27

[amyleew]

Routing instructions are not properly passing into the instructions div tag. Instructions pass when I call L.Routing.control but not sure how to put them into the instructions div class or if that is the best work around.

.onAdd function is causing map.getSize() error below, although I can successfully console the value...

[amyleew]

Fixed with map parameter pass ^^