Explicit flag value

[Exelord]

We should check explicitly for a true value as a condition to turn ON the flags.
In case if someone will use strings based value "false", "true" eg using dotEnv settings (which does not support boolean values) the addon will gonna interpret "false" as true which is not expected.

ember-feature-flags/addon/services/features.js

Lines 58 to 61 in 93113e7

	_featureIsEnabled(feature) {
	let normalizeFeature = this._normalizeFlag(feature);
	return this._flags[normalizeFeature] || false;
	},

As the best solution, we should parse the flag value (in case of string) and look for

• true
• false
• 0
• 1

Or as a minimum, we should check explicitly if the value === true