Adds nan to build.
Switches to Nan declarations.
Moves to Nan alternative functions.
Final changes for nan support.
Renames handle -> device_handle to not conflict with ObjectWrap.
Converts transfer.cc to use nan.
Adds frameworks for OSX building.
Merge pull request #48 from nonolith/tcr-nanagain

Supports Node 0.8-0.11.13+ by using Nan.