bump MRI to 2.1.4

no changes expected from this
manually patch js-emoji

https://github.com/iamcal/js-emoji/pull/19 has been stagnant for two
weeks without review, and we need this change now for users on OS X
10.10, so switch to using manually patched vendored version of js-emoji
for now.
bump newrelic
update readme

missing libraries, minor edits to bring up to date
add links to FAQ etc