New point and line demos

New point and line demos

The point demo shows off multiple points each using a morph from one
sampler to another, and applying a hue to each point based on it's
angle.

The line demo shows off morphing between two position buffers.

The textured demo shows a single geometry being used by 2 different
renderers each with a different material, and also shows off uniform
mapping by animating a "fade-color" property which is mapped to a
"uFadeColor" uniform.

Change-Id: I53c0ed2f3849dffd4b9461f07bbce75308811d9b
Signed-off-by: David Steele <david.steele@partner.samsung.com>