Spidercrab and spidercrab_1000_test.py minor fixes
Spidercrab simple stats and their usage

Related to tasks #106 and #103.
Copy of small exemplary data script
Content type filter, spidercrab master threading

Implemented a filter of supported content types. Spidercrab master has
now an ability to run in threads. Related to: #106 and #103.
Fix lack of uuid in Content nodes...
i06t03 and i06t07 - Spidercrab master and slave

Improved Spidercrab master and slave functionalities:
* Fix bug of loop in recursion of finding another content source when a
particular source is no longer available on given url
* Improved _news_is_supported() method
* Fixed Corleone config fetching for command line options inside
spidecrab init scripts
* Add logging stats into json file inside logs/ directory
* Add -t option (for stats exporting) to spidercrab init scripts

This commit closes tasks #103 and #106.
Add stub_for_mantis_kafka_push() in Spidercrab

Related to task #105.