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String.trimStart()

Pushes support back to IE9.

/**
 * String.prototype.trimStart() polyfill
 * Adapted from polyfill.io
 */
if (!String.prototype.trimStart) {
	String.prototype.trimStart = function () {
		return this.replace(new RegExp('^' + /[\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF]+/.source, 'g'), '');
	};
}