Allow exact file patterns to be specified below wildcard patterns

[vojtajina]

First pattern matching a file wins. It might be helpful to make an exception, if you specify exact file name (without any wildcard character).

Example:

files: [
  {pattern: 'src/**/*.js', included: false},
  {pattern: 'src/main.js', included: true}
]

The second pattern won't match anything, as the src/main.js gets matched by the first one and therefore it won't be included. I think we should special-case this.