Implement unbuffered code block for var setting

[paradoxxxzero]

This should partly fix #98
Semicolons are used to separate multiple instructions in code blocks. I'm not too proud about that and about the parseTextBlock() part

In any case, this allows to write:

- var a = 1;

-
  var b = [
    1,
    2,
    4,
    3,
    7
  ];

-
  var c = 2;
  var d = c * 2;

I added this as a test case.

Please review.

[kakulukia]

Since there are no updates to pyjade and its successor recently was deleted from pypi, I took the liberty to revive it: https://github.com/kakulukia/pypugjs

Version 5.0.1 has fixed the incompatibility with recent Django versions.
I'll be happy to merge this into the next version if you resubmit the PR to my repo.