Script to create zip and tar of Polycube with submodules

[pinoOgni]

This PR introduce a script to create an archive (zip and tar) with all the polycube sources, including submodules. It is possible to choose to make an archive from a branch with a version or from a tag and use the tag for the version.

[frisso]

@pinoOgni This looks really great!
@sebymiano Two comments.

1. I moved line "git log -1" into an "if/then/else" block, so to avoid this to be executed always. This is useful when you want to compile the sources from the source pack, when you may not have git installed.
2. I wonder if the 'install' should support one more option, such as "install everything" or "install only binaries". What do you think?