Fixed issue with being unable to mock internal classes (eg. SplFileInfo) in PHP v5.5.14.
Tidied up, removing heredoc
Fixed issue with being unable to mock a special internal class multiple times
Merge pull request #357 from asmblah/internal-php5.5.14

Fixed "Erroneous data format" error when mocking internal classes (eg. SplFileInfo) in PHP v5.5.14.