closed #2745: fix bug: _dataLen not set at Image::initWithString() and Image::initWithStringShadowStroke()
Merge pull request #3617 from boyu0/bug2745_after_PerformanceTextureTest_render_error

closed #2745: fix bug: _dataLen not set at Image::initWithString() and I...
Merge pull request #3620 from samuele3hu/developTest

Develop test