Release v0.12.0

• Fix release.json (7c85981)
• Merge pull request #34 from ahomu/v0.12 (ff133b3)
• Add package release-it (138fd6b)
• Update documents (2c1edc1)
• add horizontal layout style for default theme (fff40a3)
• add option linkShouldBlank (85aa4c7)
• Add doctype (90e1df1)
• Update postcss.config (2bd04f3)
• Fixed that transition suppression was not appropriate. (1a40e69)
• Merge pull request #26 from ahomu/greenkeeper/browserify-14.1.0 (415cf45)
• Merge pull request #27 from ahomu/greenkeeper/postcss-csso-2.0.0 (1a4293b)
• Merge pull request #28 from ahomu/greenkeeper/postcss-cli-3.0.0 (2c6639c)
• Merge pull request #24 from ahomu/greenkeeper/serve-3.0.0 (87341f0)
• Merge pull request #25 from ahomu/greenkeeper/rxjs-5.1.0 (a411701)
• chore(package): update postcss-cli to version 3.0.0 (ce27224)
• chore(package): update postcss-csso to version 2.0.0 (5ba3e58)
• chore(package): update browserify to version 14.1.0 (a7010c0)
• fix(package): update rxjs to version 5.1.0 (6e63876)
• chore(package): update serve to version 3.0.0 (87d41b2)