v0.15.0

• Upgrade: Espree to 1.9.1 (fixes #1816, fixes #1805) (Nicholas C. Zakas)
• Fix: make rules work with for-of statements (fixes #1859) (Mathias Schreck)
• Fix: Enable globalReturn for Node.js environment (fixes #1158) (Nicholas C. Zakas)
• Fix: Location of extra paren message (fixes #1814) (Nicholas C. Zakas)
• Fix: Remove unnecessary file exists check (fixes #1831) (Nicholas C. Zakas)
• Fix: Don't count else-if in max-depth (fixes #1835) (Nicholas C. Zakas)
• Fix: Don't flag for-of statement (fixes #1852) (Nicholas C. Zakas)
• Build: Test using io.js as well (Nicholas C. Zakas)
• Change customformat value to path (suisho)
• Docs: Add a missing word in the Contributing doc (Ben Linskey)
• Docs: Fix typo in wrap-iife rule doc title (Ben Linskey)
• Docs: Update pages to fix rendering of lists (David Anson)
• Fix: new-cap should allow defining exceptions (fixes #1424) (Brian Di Palma)
• Update: Add requireReturnDescription for valid-jsdoc (fixes #1833) (Brian Di Palma)
• New: rule no-throw-literal added (fixes #1791) (Dieter Oberkofler)
• New: multi-line option for the curly rule (fixes #1812) (Hugo Wood)
• Docs: fix typo in configuring docs (mendenhallmagic)
• Update: Backslashes in path (fixes #1818) (Jan Schär)
• Docs: Update pages to fix rendering of lists and fenced code blocks (David Anson)
• Docs: add webpack loader to the docs/integrations page (Maxime Thirouin)
• Breaking: space-before-function-parentheses replaces space-after-function-name and checkFunctionKeyword (fixes #1618) (Mathias Schreck)