AshCalc v1.2

Changes:

• Fixed bug with application window not resizing properly when components resized
• Added executables for Windows and Ubuntu that can be downloaded and run without having to install Python

AshCalc v1.1

Changes from version paper:

• (#16) Added command line interface, ssee README.md for details. Thanks to John A Stevenson.
• (#17) fixed compatability of > matplotlib 2.2