Correct a memory leak in the las reader when reading colors.
Fix a memory leak when reading each coordinate from a json file.
Add in support for writing JsonValues to vtkOStreamWrapper.

While gcc and clang can infer the usage of ostream << operators, visual studio
can't and instead we need to write an overload to help it out.
Merge pull request #5 from robertmaynard/correct_memory_leaks

Correct memory leaks
Merge pull request #8 from robertmaynard/stream_support

Add in support for writing JsonValues to vtkOStreamWrapper.
Remove usage of VLA's as they aren't supported by C++.