GRPCGATEWAY-20 match against named URL template slots correctly#21

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ndolgov wants to merge 3 commits intobtlines:masterfrom

ndolgov:feature/20180117/url-parameter-template

Commits on Jan 18, 2018

add initial support for URL parameter templates
ndolgov
committed

Commits on Jan 19, 2018

add a CodeGeneratorRequest-based unit test; disable debug logging; update scaladocs
ndolgov
committed
throw exceptons only when an invalid URL pattern is detected
ndolgov
committed