Updated some german abbreviations & added support for fractional housenumbers

[arnesetzer]

:wave: I did some awesome work for the Pelias project and would love for everyone to have a look at it and provide feedback.

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Here's the reason for this change :rocket:

• [X] Got a project with these type of housenumbers
• [X] Other project, where "bei Berlin" (near Berlin) won't be found caused by the name "b.Berlin"

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Here's what actually got changed :clap:

• [x] Added some german abbreviations
• [x] Added support for fricitonal housenumber appendix like "3 1/4". Didn't knew that this was a thing until I got hands on this project. Examples:
• https://www.openstreetmap.org/way/207516185
• https://www.openstreetmap.org/way/207516186
• https://www.openstreetmap.org/way/319538694
• https://www.openstreetmap.org/way/173507661

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Here's how others can test the changes :eyes:

Import the german osm data and try to find these buildings by their address. As far as I concerned these are written down correctly in OSM

[missinglink]

hi @arnesetzer there is an issue running CI for external contributors. I hopefully have it fixed in https://github.com/pelias/parser/pull/160

Please rebase master against your branch and push to trigger the CI

[missinglink]

@arnesetzer the unit tests are failing, you can run them locally with the command npm test