Merge pull request #18 from open-source-contributions/add_bzip

Add Bzip feature and description

README.md

@@ -8,13 +8,15 @@ It supports the following compression formats:
 
 - Zip
 - Gzip
+- Bzip
 - Tar (gzip or bzip)
 
 With the following adapters:
 
 - `PclZip`, based on the [PclZip library](http://www.phpconcept.net/pclzip/)
 - `ZipArchive`, based on PHP's [Zip extension](http://fr.php.net/manual/en/book.zip.php)
 - `Gzip`, based on PHP's native Gzip functions
+- `Bzip`, based on PHP's native Bzip functions
 - `Tar`, based on the [Archive_Tar library](https://github.com/pear/Archive_Tar) from PEAR
 
 ## Installation