Add failing test for #234

* Change .gitignore to support IntellJ IDEs
* Change .gitignore to specify that node_modules and coverage are folders
* Modify supports-color mock to allow export override
* Add failing test showing that enabled does not work

test/no-color-support.js

@@ -0,0 +1,16 @@
+import test from 'ava';
+
+// Spoof supports-color
+require('./_supports-color')(__dirname, {
+	level: 0,
+	hasBasic: false,
+	has256: false,
+	has16m: false
+});
+
+const m = require('..');
+
+test.failing('can be forced on using chalk.enabled', t => {
+	m.enabled = true;
+	t.is(m.green('hello'), '\u001B[32mhello\u001B[39m');
+});