compatible version for 0.11.x without breaking current version.
Merge pull request #37 from yorkie/master

compatible version for 0.11.x without breaking current version.
Natives moved to src
Prepare to v5.0.0

Now compatible with NodeJS v0.11.13
Added prefixes for cpu and heap files
  (profile.cc -> cpu_profile.cc)
Added Heap_Graph API
Updated Nan dependence to 1.2.0
Rewrited HEAP getHeapStats
  (now receives iterator and callback functions)
Cleared JS API
Removed postinstall linking script
Changed homepage link
Added tests for binging