Merge pull request #3169 from Patroklo/develop

Change name didn't work if reset initialization it's true
Using ImagePNG in CAPTCHA helper
Using ImagePNG function, if ImageJPG not exists
Merge pull request #3173 from ET-NiK/develop

Using ImagePNG in CAPTCHA helper
Polish changes following PR #3173
Skip CI_Encrypt tests if MCrypt is not available

Rel: #3185
Fix #3187
Merge pull request #2 from EllisLab/develop

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