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
In theory this line is unsafe:
Current realisation of v8-profiler don't support pre-gyp, therefore if v8-profiler will not builded, there will thrown a critical error.
However, if v8-profiler will not builded, installation of node-inspector also will fail, and this line will be unreachable.