ignore tmp (Rubocop)
fix Aruba backtrace
fix always matching regexp in show feature
require open3 at top
add various TODOs in code
use Helpers
remove deprecated Guard::Guard class
add feature to expose notifiers cmd bug
fix "notifiers" command
move deprecated dsl method
drop support for RubyGems < 1.8.0
remove --show-deprecations option
reenable deprecations
deprecate whole guard/guardfile.rb
rework deprecation support
allow all specs to work in isolation

- rework requires throughout project
- use IO::NULL instead of Guard::DEV_NULL
- temporarily move Setuper cod back to Guard
- stub Pry in commands
reduce complexity of _prepare_scope
reset global variables
fix features on travis (use :cucumber)
fix strict mode