Generate the proper number of lanes / directions for OSM data

[basicNew]

We should consider:

• The type of highway (motorway, trunk, primary, secondary, tertiary, residential, unclassified, etc).
• Whether it is one way or not.
• Whether the number of lanes are specified or not.

See http://wiki.openstreetmap.org/wiki/Key:highway

[basicNew]

While doing this we found that, in OSM, is very common for a road to be split in many ways with the same name. On top of this, the different parts of the road may have different lanes, with no clear indication on how those lanes should line up (e.g. think of a road with 4 lanes that suddenly converts to 3 lanes; should we align them left or right). So, using the proper lanes as OSM dictate would entail actually constructing a logic representation for the road (based on all the pieces) and rearranging the baseline geometry of each piece to make a single road that makes sense as it adds/removes lanes.

[basicNew]

See also #160 for an early symptom of the description above.