disable development tools for Travis build
trigger travis build
drop support for Ruby 1.8
mention required Ruby version in README
remove Ruby 1.9 support from TODO
Merge branch 'travis' of https://github.com/filiptepper/feedzirra into filiptepper-travis

* 'travis' of https://github.com/filiptepper/feedzirra:
  remove Ruby 1.9 support from TODO
  mention required Ruby version in README
  drop support for Ruby 1.8
  trigger travis build
  disable development tools for Travis build