Use only bundler as development dependency
Always install yard and kramdown
Use ddplugin 0.1

Conflicts:
	Gemfile.lock
Add 2.1.0 to Travis config
Do not use safe level 4 on Ruby 2.1.0
Require rubysl on Rubinius
Send build notifications to #nanoc
Do not use rubocop from git
Add psych to Gemfile for Rubinius

Conflicts:
	Gemfile.lock
Allow JRuby and Rubinius failures
Fix .travis.yml syntax
Quiet down IRC notifications by Travis
Bring Travis IRC notifications in line with GitHubs
Rename misleading #paths_without_snapshot
Remove unused kind attribute in #load_objects

Conflicts:
	lib/nanoc/core/data_sources/filesystem.rb
Extract #load_object method
Simplify test task

Conflicts:
	Gemfile.lock
	test/helper.rb
Ignore .bundle and .yardoc
Do not capture IO in tests
Remove skip env var support in tests