feat(json.js): add wrapper for JSON.parse
feat(json.js): add wrapper for JSON.parse

It's a really thin wrapper around JSON.parse, which enables support for legacy browsers and
polyfills. This may be removed in the future.

MobileWorks/inbox.js,iconartus/inbox.js,MobileWorks/inbox.js,nylas/inbox.js,MobileWorks/inbox.js,iconartus/inbox.js,iconartus/inbox.js,nylas/inbox.js