added column and row reordering and reversing, zeros matrix, zigzag matrix, and get column
added tests for new functions
made statistic.randomSample more efficient, added MonteCarlo integral approximation method
forgot to complete docstring for monte carlo
fixed global leak in zeros,zigzag functions
added semicolons and fixed a throw
let montecarlo take arbitrary number of arguments for intervals
added throw for montecarlo, clarified some var declares in zigzag
forgot to take out a test case, whoopsies
Merge pull request #97 from StDako/master

added multiple functions to numbers.matrix