Added Support for changing parallaxFactor programatically

[iampkhan]

While doing one of my projects I wanted to add some child views to the ParallaxLinearLayout dynamically from java source, but to add parallax effect to them programatically these changes are necessary.

[heinrichreimer]

You should change pFactor to parallaxFactor

[iampkhan]

The class already contains a field with the same name

[heinrichreimer]

Didn't you know the this keyword?
Just rename the method parameter and then assign the variable like this:

this.parallaxFactor = parallaxFactor;

[iampkhan]

I completely forgot about the this keyword, my mistake, updated the code