v1.5.9
docs: fix typos throughout the codebase
chore(eslint): enable `quotes: ["error", "single"]`
chore(*): switch from JSHint/JSCS to ESLint
chore(build): Update closure i18n integration
feat(ngParseExt): New ngParseExt module
chore(ngLocale): Include numberformatsymbolext.js in Closure Slurper Script