Add Jekyll::Logger
Add Jekyll::Deprecator
Run Jekyll::Deprecator.process upon invocation of Jekyll
Bring Logger and Deprecator into the fold
Move manual printing to Jekyll.info and Jekyll.warn
Add colorator gem
Colorize warns as yellow
Matching tests to new colorized output
Error message is red
minor test fix: the variable is named page.path
Remove Logger methods from main Jekyll module.
Merge pull request #968 from maul-esel/cucumber-fix

minor test fix: the variable is named page.path
Merge pull request #959 from mojombo/deprecator

Refactor Logging and Deprecation Messaging