Merge pull request #12 from 6ahodir/master

Minor formatting changes. Python 3 support.
Merge pull request #13 from 6ahodir/master

added SMA
Added EMA, SMSTD and EMSTD technical indicators.
Added MACD technical indicator.
Merge pull request #14 from 6ahodir/master

Added a simple GTK+ GUI
Style fix. Typo fix