triangle class, manipulation and plt kwargs

• added triangle class
• solid revolution only when axis is specified
• translation, rotation and scaling methods
• plt kwargs in plot methods
• prepared release on PyPi

What's Changed

• Centers triangle by @gerritnowald in #5
• Manipulate (translation, rotation, scaling) with magic methods by @gerritnowald in #6
• product second moment of area including test by @gerritnowald in #7
• Prettier plots by @gerritnowald in #8

Full Changelog: v1.0.0...v1.1.0