graph_workers directory cleanup
i05t11: Synchronized news fetchers database setup

Database structures setup, local Spidercrab configuration and its
registration in a remote database.
Merge branch 'dev' into spidercrab (not verified)

Conflicts:
	graph_workers/odm_client.py
	odm_server.py
	scripts/ocean_small_exemplary_data.py
Merge fixes (to verification)
i05t11: Spidercrab implementation work in progress
i05t11: Synchronized news fetchers (Spidercrab)

Finished adding news' content to database.
Spidercrab slave and master separate scripts

Created `/graph_workers/spidercrab_master.py` and
`/graph_workers/spidercrab_slave.py` scripts which give an ability to
quickly run your Spidercrab master or slave using a selected config file
(see -h for passing non-standard config file and other options).
Finished scheme of Spidercrab and Neo4j management

Finished management of adding and populating ContentSources and created
a scheme of data flow. Everything will be described on wiki before
merging spidercrab branch.
Spidercrab Don Corleone support

Spidercrab will now load config from Ocean Don Corleone as default.
It will complain if there is no config there, but you can still pass
external Spidercrab JSON config file as an argument (see -h).
tests/spidercrab_correctness_test.py

Simplest Spidercrab correctness test.
Don Corleone config master and slave separation

Separated config for master and slave Spidercrab instances and
functionality of adding runtime options inside the Corleone config
(values from Corleone config are defining a new default values for
options from scripts' command line)
Merge pull request #98 from bziiuj/spidercrab

Spidercrab