Merge pull request #6 from zomble/php

A couple solutions in PHP
Some more problems.
Check if the two strings are the same length
Merge pull request #7 from YoussefKababe/master

Strings length issue.
Clean up code.
Add optimized multiples-of-3-and-5 in Python
Add newline at EOF
Merge pull request #8 from amitburst/master

Add optimized multiples-of-3-and-5 in Python
Adding some more problems.
Add array search problem.
Random integers don't have to be sorted
Merge pull request #9 from YoussefKababe/master

Integers randomness problem.
Realised there is a problem with the array pair sum when the array is a different order.
Completing some more code problems.
Add a couple more problems.
Optimize code and use less variables
Merge pull request #10 from YoussefKababe/master

Optimized code
0 AND 1 are no prime numbers

http://en.wikipedia.org/wiki/Prime_number
Merge pull request #12 from Almewty/patch-1

0 AND 1 are no prime numbers
Implement fix for the issue mentioned in #13.