Merge pull request #7 from HemEM/master

Some smaller corrections in IsPrimeZeroDim.
Merge pull request #8 from HemEM/master

Some Corrections on PrimaryDecomposition.
Merge pull request #9 from HemEM/master

Outsourced the second iterator, added examples and installed a list, which stores all irreducible factors of degree higher than one.
Merge pull request #10 from HemEM/master

Sorted output list of SquareFreeFactors and changed some comments