Add Builder for PlaceRequest

New internal Builder class for PlaceRequest; most constructors as well
as with method have been deprecated in favor of new builder methods.
Package visible constructor has been made private and its usage in
RouteTokenFormatter adapted to usage of builder.
Implement CodeReview comments
Minor formatting changes
Merge pull request #239 from bmoritz/bm_PlaceRequestBuilder

Add Builder for PlaceRequest, fixes issue 128