Import Sobel filter demo
Ported Sobel Filter Demo to WebKit-WebCL.

* Fixed wrong identation from original source.
* Updated demos.txt file.
Update demos.txt

Added two columns to show which device is supported by the examples.
Added Ripple effect source code

Signed-off-by: Andre Luiz Viana Loureiro <andre.vl@samsung.com>
Setting the file format to unix pattern and fixing some code style

Signed-off-by: Andre Luiz Viana Loureiro <andre.vl@samsung.com>
Ripple effect running on SRA's webcl implementation

Signed-off-by: Andre Luiz Viana Loureiro <andre.vl@samsung.com>
Updated demo.txt

Signed-off-by: Andre Luiz Viana Loureiro <andre.vl@samsung.com>