Yii2 Disable Submit Button Asset

2.0.0

[BRK] PHP Requirement upgraded to 5.6 (Faryshta)
[BRK] Class faryshta\assets\ActiveFormDisableSubmitButtonsAsset replaced by faryshta\disableSubmitButtons\Asset (Faryshta)
[Enh] Added jQuery methods disableSubmitButtons() and enableSubmitButtons() (Faryshta)
[Enh] Live Demo with instructions on [README.md] file