add parse float from file

three triangle has been move to res/raw/triangle123
Merge branch 'master' of github.com:lc85301/3dmm_hw2

Conflicts:
	HelloTriangle/gen/R.java.d
	HelloTriangle/gen/example/opengles/hellotriangle/R.java
	HelloTriangle/src/example/opengles/hellotriangle/HelloTriangleRenderer.java