Bump up asakusafw version to 0.8.0-SNAPSHOT.
Bump up asakusafw version to 0.8.0-SNAPSHOT.

akirakw/asakusafw-compiler,ashigeru/asakusafw-compiler,ashigeru/asakusafw-compiler,ashigeru/asakusafw-compiler,asakusafw/asakusafw-compiler,asakusafw/asakusafw-compiler,akirakw/asakusafw-compiler