Fix code comment

- coffee-script -> jade
Merge pull request #64 from tricknotes/fix-code-comment

Fix code comment
fixed current travis state
Making lazy templates implementation more elegant

Instead of define `fn.solve`, now it's necessary to define a method
`toString` int the template class and a function property called
`lazySource`.
Documentation included.
partial tests cleanup & lint cleanup
Improving tests

- Making them pass through Lint;
- Improving readability.