[Review] Request from 'wstephenson' @ 'SUSE/connect/review_140602_config_write_interface'

Please review the following changes:
  * e0a2a71 Allow options to override config file
  * 85973c8 Remove copy and paste error from apidocs
  * 70cc8b3 Merge branch 'master' into review_140602_config_write_interface
  * ca4c417 Method and test for writing config file from YaST
  * c18c68e Add method and test for writing config from Client
  * afb85db Make config a member variable
  * f8bb54c Filter the attributes which are written to the config file
  * 350371f Reorganise config rspec
  * 02c4fcf Specify which attributes should be serialized