implemented composer feature
moved class to src folder
Merge pull request #40 from Rvanlaak/master

Implemented composer.json
rapid2k1's PR modified to work in the new folder

I merged a composer PR and it messed his original PR so I just put his changes on the file in it's new location.

https://github.com/clouddueling/mysqldump-php/pull/37
Update README.md
Merge remote-tracking branch 'upstream/master'