[ACID]New tests image orientation

Systematic test of image orientation (`XDir` and `YDir`) and axis visibility (`axis off`)
* imageOrientation_inline works as expected
* imageOrientation_PNG fails due to bug, unrelated to test

R2014b: Reference output is messed up (unrelated issue)
![acid_imageorientation](https://cloud.githubusercontent.com/assets/4340267/4917612/3cdada36-64e7-11e4-8e9d-abdbbbc9267f.png)

R2011b: Everything is fine for inline test
![acid_imageorientation_r2011b](https://cloud.githubusercontent.com/assets/4340267/4917611/3cd78912-64e7-11e4-8929-be333d6646a3.png)