Fix NumberFormatException and refactor YahooWeatherProvider#40

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m-rm wants to merge 23 commits intosurvivingwithandroid:masterfrom

Commits on Nov 18, 2015

Fix NumberFormatException when showing current weather for Ischgl, Austria (Wind direction and speed is an empty String)
m-rm
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Cleanup YahooWeatherProvider.java
m-rm
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Unify parsing of current weather and forecast
m-rm
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Commits on Apr 18, 2016

Adaptions to recent Yahoo weather changes
m-rm
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Commits on Sep 5, 2016

Adaptions to Yahoo GeoPlanet shutdown
m-rm
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Commits on Jan 12, 2017

Commits on Jan 13, 2017

Commits on Jan 16, 2017

Commits on Jan 19, 2017

Commits on Jan 20, 2017

Add snapshot repo
M-RM
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Refactoring provider
M-RM
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