log: trace_id is 64 bit now. Exporting of trace_id to eblob added.
Merge branch 'master' of https://github.com/reverbrain/elliptics
foreign: React is now shared library.

- React added to debian and rhel dependencies
- Usage of react is changed according to it's public API
- React submodule removed
- Definitions of react elliptics actions and react_manager moved to elliptics
- Rapidjson is used from react includes now
tests: Elliptics in python tests migrated to json.
trace_bit value in python tests changed to 2**63
core: trace_id migrated to uint64_t
tests: python Overflow test boundary for trace_id changed to 2**64
python: CMake fixed to use the same version of python
Merge branch 'master' of https://github.com/reverbrain/elliptics

Conflicts:
	foreign/react
	tests/pytests/server.py

react submodule removed
server.py taken from reverbrain master
react: Error handling on react creation in dnet_process_cmd_raw changed.
Redundant newlines removed.
log: trace_id type in eblob_backend.c changed to uint64_t
Merge pull request #405 from IIoTeP9HuY/master

React shared library. Python tests fixes.