v2.0.4

Change log:

• Add: Option to install the project with bower:
  bower install --save super-repo
• Add: .invalidateData() method now returns a Promise, that resolves to {Object} that has prevData {Object} and the nextData {Object}
• Add: .clearData() now returns a Promise, that resolves to prevData {Object} - the previous (just deleted) data
• Add: more explanations and more examples in the documentation
• Add: more detailed example in the examples directory.
• Fix: set the default value for the outOfDateAfter option to -1 (like it was told in the docs)