Update Deserializer.cs

Proposing to change the strings to UTF8 (Unicode support) or accents are not properly interpreted.
Also fixing the rain data issue (humidity is given instead).
Update Weather.cs

Adding the icon field.
Update Deserializer.cs

Populating the icon field.
Update Daily.cs

Adding language and units.
Update Forecast.cs

Adding language and units
Update Current.cs

Adding language and units
Merge pull request #4 from stephanecodo/patch-2

Rain issue and UTF8 support - Update Deserializer.cs