[Review] Request from 'KalabiYau' @ 'openSUSE/osem/review_140721_basic_rubocop_rules'

Please review the following changes:
  * ad2ec92 Add rubocop to travis run
  * bce659a Move Accessor names to todo
  * 5289f41 Use only new hash syntax
  * 3901973 Do not use variables in void context
  * 31212b4 Fix linting cops
  * 056fe5e Fix others additional lints
  * 763f864 Fix basic style issues with rubocop
  * f4a2285 Update rubocop and add basic checks
  * 9f03531 Merge pull request #345 from ChrisBr/bugfix_events_index
  * 9d54d0d Added nil checks for call for papers in event index Changed first / lastname to name