Fix to allow = as a character in the env file

I had the problem that i was storing a part of a URL in my .env file and it was cut off. With this fix it'll work.

here also a fix for the test file `envs-commented.test.js`
```javascript
var parsedHash = envs.KeyValue(
  '#commented heading. \n' +
  'key = "quoted#hash" \n' +
  'key2 = stripped#comment \n' +
  'key3 = =equal=in string= \n'
)

assert.equal(parsedHash['key'], 'quoted#hash')
assert.equal(parsedHash['key2'], 'stripped')
assert.equal(parsedHash['key3'], '=equal=in string=')
```