Fix code issues

<a href="https://github.com/sicambria"><img src="https://avatars3.githubusercontent.com/u/9528352?v=4" align="left" width="96" height="96" hspace="10"></img></a> **Issue by [sicambria](https://github.com/sicambria)**
_Tuesday Jan 15, 2019 at 14:39 GMT_
_Originally opened as https://github.com/sicambria/skilltree/issues/10_

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Refactor code and fix all major issues.
https://codeclimate.com/github/sicambria/skilltree
https://lgtm.com/projects/g/sicambria/skilltree/alerts/?mode=list


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Fix code issues #23

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Fix code issues #23

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