Implementation of blueprint stackalytics-core

* Data updater is implemented
* Completed implementation of commit processor
* Logging is added into commit processor and runtime storage
* Commit processor is fixed
* Domain-company map is inverted
* Extracted get update count into separate function
* Fixed regex that matches diff statistics (lines inserted, lines deleted and files changed)
* Implemented caching of unknown users
* Replaced dictionaries by sets for pids and branches
* Vcs is responsible for module and branches fields of commit record
* Added release tags support
* Implemented statistics by company
* Added config for releases
* Implemented front-end for companies details
* Implemented front-end for modules details
* Fixed metric switch
* Implemented timeline rendering
* Release selector is fixed
* Chdir is needed after cloning a new repo
* Company details screen is implemented
* Fixed invalid emails processing by Launchpad
* Fixed parsing of 0 files changed case
* Module details screen implemented
* Commit message is cleared and links are inserted
* Engineer details screen is implemented
* Fixed mapping from company to email for subdomains of 3rd level
* Fixed wrong user structure for users not found by LP
* Also coverage for commit processor
* Fixed company matching algorithm
* The company was not matched when user email had more domains than company's one
* Add option to enforce sync with default data
* Default data is added. Old confs removed
* Add *.local into gitignore

Scripts cleanup

Moved from pylibmc to python-memcached

Library pylibmc depends on libmemcached and doesn't work on CentOS (version conflict bw lib requirement and memcached).

Change-Id: I0cc61c6d344ba24442ec954635010b518c0efa95