Re-fix: Grouped filters with filterCount%2==0 are flipped

[asydorov]

We should flip bitmap once instead of flipping scene for every filter in a group.

[linjiansheng]

@asydorov THX!
GPUImageTwoInputFilter.java also need change:

    public void setRotation(final Rotation rotation, final boolean flipHorizontal, final boolean flipVertical) {
        float[] buffer = TextureRotationUtil.getRotation(rotation, flipHorizontal, flipVertical);

        mTexture2CoordinatesBuffer = ByteBuffer.allocateDirect(TEXTURE_NO_ROTATION.length * 4)
                .order(ByteOrder.nativeOrder())
                .asFloatBuffer();
        mTexture2CoordinatesBuffer.put(buffer).position(0);
    }

TEXTURE_ROTATED_90 is same with iOS GPUImage rotateLeftTextureCoordinates, anticlockwise?

[tbfly]

mark

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