Default to .cane from rake task

Allows Cane::RakeTask.new to use the settings in .cane, without needing
it explicitly in a block
Add spec for previous commit
Remove stubbing from integration test.
Merge branch 'justincampbell-use-canefile-from-rake'
Colorize output with --color

Displays all violation in red
Merge branch 'color' of https://github.com/justincampbell/cane into justincampbell-color
Only colorize if max violations is met
Merge branch 'color' of https://github.com/justincampbell/cane into justincampbell-color
Merge branch 'justincampbell-color'