Version 2.0.0

• Updated SDK to use PSR4 autoloader internally
• Add PHPDoc to all functions
• Minimum Support for PHP changed to 5.6
• Bug fix for Empty Transformation Values
• Introduce new API
  • bulkAddTags
  • bulkRemoveTags
  • copyFile
  • moveFile
  • createFolder
  • deleteFolder
  • copyFolder
  • moveFolder
  • purgeCache
  • getPurgeCacheStatus
  • bulkDeleteFiles
• Deprecated Functions
  • purgeCacheApi
  • purgeCacheApiStatus
  • bulkFileDeleteByIds