Cleaning remnants of subsurface

Subsurface is no longer needed for this application. ( I don't know why I added
it in the first place. It complicated my approach too much. This could probably
cost my GSOC '14).
Appropriate changes made in build.sh to remove subsurface dependencies.

Signed-off-by: Venkatesh Shukla <venkatesh.shukla.eee11@iitbhu.ac.in>