Release v0.4.0

What's Changed

• Update the version of SCALE library we use. by @ywkawai in #117
• Feature/turbulence by @ywkawai in #115
• Add -f option into rm in a Makefile. by @ywkawai in #118
• Feature/cubed sphere mesh by @ywkawai in #121
• Add some files to generate reference manuals using doxygen. by @ywkawai in #125
• Feature/interp tool by @ywkawai in #126
• Feature/check temporal scheme by @ywkawai in #129
• Feature/refactor coriolis by @ywkawai in #130
• Refactor codes to generate initial data. by @ywkawai in #131
• Add a statement of dependency. by @ywkawai in #132
• Refactoring for physical processes. by @ywkawai in #134
• Update documents for release v0.4.0 by @ywkawai in #135

Full Changelog: v0.3.0...v0.4.0