Merge pull request #18 from delphiki/master

Fixed custom document layout
Update changelog.txt
Cleanup source code
Cleanup source code #2
Cleanup source code #3
QA: Start unit tests enhancements
Only shows errors in phpcs (suppress warnings)
Update Travis
Update phpcs source folder
QA: Custom PHPCS ruleset
Fix some phpcs errors
Fix uppercase constants
QA: Fix docblocks
Save examples results to results folder
Tweak samples and initiate documentation
Doc: Update manual & README.md
Doc: Update manual and changelog
Doc: Writers documentation
QA: Writers tests
Refactor: Change PHPPowerPoint_Shape_Shadow to PHPPowerPoint_Style_Shadow