Parsing arguments with trailing garbage should fail

[mjerabek]

Integer arguments with trailing garbage are successfully decoded instead of giving an error: 42garbage is decoded as 42 instead of parse error

This will be also a problem for other types. I looked at the implementation and the fix should be quite simple -- just checking if the stringstream is empty after the conversion.

[grafikrobot]

Fixed in Lyra library with this change https://github.com/bfgroup/Lyra/commit/cdd5a924160402e7fb94736103e40cb64e0e27b1