Improve release (and pre-release) process

[kirypto]

• [x] The specification submodule should use branches instead of tags so the submodule can properly link to it.
• [x] The version file should have the full "alpha/beta" instead of "a/b" as described in semver.org (currently only not done because StrictVersion class does not support it)_.
• [x] The submodule should be linked to the correct branch for that version.
• [x] The Deployable.zip should have a comfig.yaml by default

[kirypto]

Done, should simplify the process going forward.