ack: classify ".feature" (Cucumber) files as ruby
ack: classify ".feature" (Cucumber) files as ruby

This is not strictly true, as feature files are written in "Gherkin" (a
custom DSL that reads like plain English), but they are always part of
Ruby projects so it makes sense to include them under "ruby".

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent