3.3.3
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* Platform Overview
  - Major reorg of the platform overview (Phil Bull)
  - Merged platform demos into overview (Phil Bull)
  - Updates to various tutorials (Tiffany Antopolski)
  - Added new samples (Susanna Huhtanen)
  - Updated translation:
    es (Daniel Musteles)
    fr (Bruno Brouard)
* Human Interface Guidelines
  - Updated translation:
    es (Daniel Musteles)
* Optimization Guide:
  - Updated translations:
    de (Mario Blättermann)
    fr (Bruno Brouard)