Changes

#44 : pointsToCentimeters accept float as parameter - @Progi1984
#43 : Fixed typing & Added conversion from points to EMU - @Progi1984
#42 : Added conversion from centimeters to points - @Progi1984
#41 : Fixed Drawing pixelsToPoints and twipsToPixels ratios - @Progi1984
#40 : Improved Unit Tests - @Progi1984
#39 : Fixed some errors - @Progi1984
#38 : Improve project - @Progi1984
#30 : Simplify calls to libxml_disable_entity_loader - @troosan
#29 : Ensure that library re-sets original xml entity loading value after doing what is needed - @seamuslee001
#27 : Added PHP 7.3 support for travis - @arzurchris
#26 : Add PHPDocs - @tolbon

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