glyphhanger v3.0.1

• Large-ish rewrite using Puppeteer (headless Chrome) instead of aging PhantomJS.
• Requires node version 8.
• Adds --json to segment results for each font-family on a page.
• Adds --family='Open Sans, Roboto' to show results for one or more font-family names. Pairs nicely with --subset to create new files for a specific web font already in use on a static page.
• Adds --css to output @font-face blocks for each font on a page (with correct unicode-range already included). Pairs nicely with --subset to put in the correct src values for your subset files (will also create CSS files for you).
• Extracts content from pseudo elements :before and :after. This allows glyphhanger to work well with icon fonts.
• Adds --LATIN as a shortcut for whitelisting all of Latin character sets. Similar to already supported --US_ASCII.
• Adds --output to change the output directory any files created: CSS files and new subset web fonts.
• Adds debug output, for example: DEBUG=glyphhanger glyphhanger http://example.com/ In this same vein, this release also removes --verbose.
• Adds --timeout to change the timeout per URL (in millseconds, the default is 30000 ms).
• Now uses spider-pig for the spider internally.
• Adds a ton more tests. Running on Travis CI

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