Fix rare PclZip/realpath/PHP version problem

In PHP 5.4.4 realpath() handles absolute paths correctly, but in PHP 5.3.8 returns false.
Ensure temp file in pclzipAddFile() removed

Make pclzipAddFile() similar to pclzipAddFromString() in removing
temporary files.
Merge branch 'fix-rare-pclzip-realpath-php-version-issue' of github.com:andrew-kzoo/PHPWord into develop
Merge branch 'fix-rare-pclzip-temp-file-issue' of github.com:andrew-kzoo/PHPWord into develop
Merge branch 'develop' of github.com:bskrtich/PHPWord into develop
Update change log and adjust some coding standards for #261, #265, and #267
Refactor elements to move set relation Id from container to element
Fix Travis test error
Use section "style" instead of "settings" for consistency
Docs: Restructure documentation
Refactor PhpWord to reduce dependencies
New `PhpWord::save()` method to encapsulate `IOFactory`
Update basic example
Fix typo: ODT > ODText
Small fixes for addHtml.