Profiler API

Realisation of Profiler agent.
Implemented:
Profiler.enable
Profiler.disable
Profiler.star
Profiler.stop
Profiler.getProfileHeaders
Profiler.getCPUProfile
Profiler.removeProfile
Profiler.clearProfiles
Profiler.addProfileHeader
Profiler.setRecordingProfile
Profiler.resetProfiles

Related: #185
Before the release I need to fix unsafe loading of v8-debug and v8-profiler.
Add pre-node-gyp to this projects is not a problem, but I don't have recources to publish all versions (Linux, OS X, Windows, x64). Have you any idea how to automate this process?