Add isLowerTriangular() method
Let's not add arbitrary whitespace
Changes from code review + extra testcase for row
Replace == -> is, != -> isn't
Add isUpperTriangular method
Change documentation for new methods to codo
Change to loop the other way through array in isUpperTriangular
Change to camel case, not happy about it though
Merge pull request #3 from ishakir/master

Add isUpperTriangular and isLowerTriangular methods