Arithmetica 0.4.0

Lots of new features.

Changelog:

• Added multiline support for Linux
• Improved eval steps - removed the '/1'
• Made console output consistent on windows and linux
• Switched factor over to the new algebraic parser
• Fixed factor not working with fractional coefficients
• Made eval steps neater
• Added substeps to non-verbose eval with steps
• Fixed missing brackets in some factor steps
• eval with steps - Added pretty fraction printing
• Fixed issues #6, #13, #14, #15, #16, #17, #18, #19
• Added decimal and mixed answers to non-verbose eval with steps