Fixed a minor error in the SoftDelete readme section, so that the example is PHP5.4 Strict compatible
Resolves #19
Added a function to override `delete()`. Credit to dereuromakr, Ceeram and Augusto Franzoia.
Also added php syntax highlighting to the read me to make code samples easier to read. The opening <?php tag is required due to the `startinline` option being set to false on the Pygments install on GitHub, sorry.
Merge pull request #76 from davidyell/develop

Fixed a minor error in the SoftDelete readme section