[FIX] Case insensitive SAML email check

lib

This prevent invalid XML:
Element {urn:oasis:names:tc:SAML:2.0:metadata}KeyDescriptor: Missing child element(s). Expected is ( {http://www.w3.org/2000/09/xmldsig#}KeyInfo )
(see https://www.samltool.com/validate_xml.php)

* Add ESLint rule `prefer-template`

* Add ESLint rule `template-curly-spacing `

* ESLint ignore rocketchat-livechat/assets/rocket-livechat.js

* Add ecmascript package to all packages

* Use ecmascript package for server and client on saml package

* Fix compilation

* ESLint add rule `object-shorthand`

* ESLint rocketchat-livechat/assets/rocket-livechat.js

* Add ecmascript package to all packages

* Use ecmascript package for server and client on saml package

* Fix compilation

* Add eslit rule `one-var`

* ESLint add rule `no-var`

* Add ecmascript package to all packages

* Use ecmascript package for server and client on saml package

* Fix compilation

* meteor-accounts-saml coffee to js

* fix review

I had issues dealing with Japanese characters which used to get converted to unsafe xml characters. Instead of ascii, utf8 is a much better option.