v0.6.8

• updates documentation (89f22ca)
• adds missing jsdoc comments to scripts (b1dbe9b)
• updates package-lock.json (2d406ff)
• adds newline to d3plus-env package.json output (4a0cd33)
• Merge branch 'master' of https://github.com/d3plus/d3plus-dev (aae967a)
• updates environment (1f56637)
• enables require-jsdoc in default eslintrc (ad2e958)
• adds tts-mscorefonts-installer to travis-ci config (2095d03)
• fix(package): update rollup to version 0.63.2 (0a9e507)
• fix(package): update rollup to version 0.62.0 (683bc7d)
• fix(package): update rollup to version 0.61.2 (f182640)
• fix(package): update eslint to version 5.0.0 (df0c92b)
• fix(package): update rollup to version 0.60.7 (2fed2b0)
• fix(package): update rollup to version 0.59.0 (02a1388)
• fix(package): update rollup-plugin-json to version 3.0.0 (0c8e12d)
• fix(package): update rollup to version 0.58.2 (bd5496a)