add preview to attentionBlink
add preview to brownPeterson
Merge branch 'master' of https://github.com/thammasart/hip
add preview to changeBlindness
add preview to garnerInerference
add preview to magicNumber7
add preview to mullerLayer
add preview to signalDetection
add preview to simonEffect
Merge branch 'master' of https://github.com/thammasart/hip
fix admin link to preview