v1.0.2: New 'hexup' grid, new 'ghostly' color set

Rotated hexagons, removed tri/iso duplication, add ghostly colorset (…

…#19)

Added code to rotate hexagon pattern by an arbitrary angle. Added "hexup" pattern that rotates hexagons 90 degrees relative to default orientation.

Rewrote the triangle code, deleted iso pattern, changed iso option to draw with function triangles[rotate=90]

Added "ghostly" colorset

Converted tabs to spaces

Removed unnecessary lines that were commented out

Update version number