Breaking changes from 0.3.3->0.3.4

[cgvedant]

This package works as expected when you install it through npm(v0.3.3) but when I cloned the repo and tried to run demo.js I get the following error when it tries to evaluate $c := ...

Error: no registered db info found...
    at load (/Users/root/nquery/demo/loader.js:44:8)

The problem seems to be with the AST creation. In the newer version the AST doesn't show the tables a and b used for evaluation as 'var' type. Rolling back to the commit 395487a fixed the issue.