Merge pull request #1 from illarionov/fixIllegalStateException

Fix IllegalStateException on StackBlur.setPixels()
Merge pull request #2 from illarionov/fixRenderScriptProguard

Fix proguard renderscript (java.lang.UnsatisfiedLinkError: unknown failure)
Merge pull request #3 from illarionov/fixNoSetHasMipMapMethod

Fix NoSuchMethidException on API<17
Merge pull request #4 from illarionov/upgradeGradle

Update gradle
Adds Pralloid as gradle lib, but blind as of the moment

Many bugfixes and small changes
Merge pull request #5 from illarionov/ndkStackBlur

Add NDK StackBlur (https://github.com/kikoso/android-stackblur)
multithread stack blur