Change in order to use the travis-ci

I have to be able to run tests on **travis-ci**.
Error as shown below also auto, I added a correction.

	PHP Fatal error: Class 'Preview\Preview' not found in /home/travis/build/holyshared/preview/
	preview on line 95 PHP Stack trace: PHP 1. {main}() /home/travis/build/holyshared/preview/	preview:0 Fatal error: Class 'Preview\Preview' not found in /home/travis/build/holyshared/
	preview/preview on line 95 Call Stack: 0.0006 273816 1. {main}() /home/travis/build/
	holyshared/preview/preview:0

[Fixes]

1. Directory renamed
	* src/preview/core -> src/Preview/Core
	* src/preview/reporter -> src/Preview/Reporter
	* src/preview/result -> src/Preview/Result
	* src/preview/dsl -> src/Preview/DSL

2. File renamed
	* src/preview/dsl/util.php -> src/Preview/DSL/Util.php