fix formatting

Added missing include header, added identifier stream

make function inline

Merge pull request #68 from mapbox/value_shared_ptr

Recursive feature values through shared ptrs

Remove fields related to feature state

Move the new fields to GL Native as they are not part of
the GeoJSON specification.

std::ostream operator<< overloads

Fix compilation errors with libc++ on QNX 7

It seems that the QNX 7 compiler (i.e qcc based on GCC 5.4.0 with
libc++ from LLVM) has a limited c++11 feature support and causing
the compilation errors with the inheriting constructors. This patch
fixes the issues by providing the required constructors explicitly.

Merge pull request #51 from mapbox/g++-4.9

Build for g++-4.9

Build for g++-4.9