Make Expression parameter generic
Only dimensions can have an unequal relation with floats
Make inequality operators return NSLayoutConstraint
Merge branch 'master' into compounds

Conflicts:
	Cartography/Property.swift
Give Expression multiple coefficients
Fix multiplier when dividing properties
Merge branch 'master' into compounds

Conflicts:
	Cartography/Expression.swift
Compound operators return NSLayoutConstraint[]
Fix unsatisfiable constraints in divison test
Merge branch 'master' into compounds
Add inequality operators for Compound
Add multiplication and division for Size