Fix travis CI builds

Fix cmake error in libqes install in travis ci

Forgot the ..

Add zlib root to cmake in travis ci config

Use git clone --recursive to get libqes

fix travis

Another attempt at fixing travis ci

Nope, we'll install to /usr/local

Fix root paths in builds

Don't cache stuff in travis ci
Fix FindLIBQES and the Release CFLAGS in cmake

Fix FindLIBQES

Fix cmake optimisations