Added PHP application of Bubble Sort algorithm
Switched to hash based collections, added quickcheck tests

1. Moved to hash set and hash map from tree set and tree map because it does not make sense
   that the search nodes must be ordered which is a constraint imposed by tree set and tree map.
2. Added quickcheck property based tests.
Binary Search in PHP with PHPUnit Test
Cleaned up the tests
bubble_sort in scala
Merge pull request #56 from jakobhans/php-contrib

Added PHP application of Bubble Sort algorithm
Merge pull request #57 from abhin4v/master

Enhancements and unit tests
Merge pull request #58 from mitogh/Binary_Search_PHP

Binary Search in PHP with PHPUnit Test
Merge pull request #59 from lichtsprung/master

bubble_sort in scala