add function for counting elements
Add some general functions for mass calculation
add comments to functions
start parse equations
add parseExpression and parseAtom
add parse Atom + syntax fix
fix molecule parsing
add back the properties of atoms
fix some bugs (add parseInt) + finish percentComp
Write better descriptions
equal-sign fix
Add examples
add printable() and toEmpirical()
add a GCD() method used in toEmpirical()
add more printables
found a bug, don't know how to fix it, yet
fig bug with parseExpression
add Mol.listElements, start simplify
add LCM + add LCM and GCD to Math
add space around '=' for better print