make success text and smtp_timeout configurable
Merge branch 'master' into config
Merge branch 'master' into config

Conflicts:
	lib/health_check/utils.rb
Merge branch 'master' into config
Move test gemfiles under test, split the creation of railsapp to test/setup_railsapp,
Add extra configuration options, including custom checks, and
Add .format to routes, and restrict to http GET's only
Document configurability and custom checks
Adjust rvm versions we test against, removing outdated rvms and adding ruby 2.0.0 and rails 4.0.0-beta
Add extra git ignores
Extend tests to include formats, status code and content type
Warn if ruby version is too low for rails 4.0
Add json and xml formats
Explain formats a bit more
Add extra exclusions from travis test
Exclude most recent version of rubygems
Require rdoc and rdoc-data for rails 2.3 because the Rakefile requires rdoc/tasks
Reduce travis test options
Clean up test code and remove gemspec for rails 1.2 - we don't support it
Version 1.2.0 bump