Merge branch 'master' of https://github.com/attilammagyar/behave into attilammagyar-master

IMPLEMENTS: #227 User-specific configuration data (userdata)
Extends the base implementation provided by attilammagyar:

  * userdata is provided as dict
  * Basic type conversion support is added, similar like configparser.
  * Advanced issues are addressed, like using own configuration files.
  * Documentation adapted and extended
ISSUE #227: Fix PY2.6 unittest issue and some minor descriptions.