Added functionality to support mixins that should be once initiated / updated .gitignore to exclude IDEA-generated folder
Made a build of the updated lib.
Added the description of "addOnceInitiated" functionality to README
Updated syntax for specifying once initiated mixins.
Made 'name' required when registering a mixin, added new test to check onceInitiated functionality in replace method
Updated README to have description how to use "onceInitiated" functionality
Renamed "onceInitiated" to "initiatedOnce", updated README to support fancydocs.
Updated initiatedOnce functionaty to store params as array of arrays, added additional example to README, created new test.
Merge pull request #1 from anatolikurtsevich/master

Once initiated mixins support.