change verbs to match the ones of Vundle

[enricobacis]

I would prefer to have the verbs to match the ones used by Vundle (I opened the issue #17), so I changed:

fundle install -u -> fundle update fundle self-update -> fundle upgrade

This commit is just a draft of the changes, it should be refined for coding style.

[danhper]

Hi, and thank you for the PR.

I am fine with changing install -u to update, I agree it is more explicit, and yes, explicit is better than implicit IMO.

However, I would rather keep self-update as is, for the same reason as above, it is more explicit. Most package managers use update to update the DB and upgrade to actually upgrade the package, which does not make sense here as we do not have a DB, so even if Vundle uses upgrade, I think self-update is clearer.

Could you please update the PR with only the change from install -u to update, and update the tests, as they are currently breaking? Also, install -u should only emit a deprecation warning for now, as it could potentially break some scripts.

Thank you :smile:

[enricobacis]

I have updated the PR with the following:

• Revert self-update -> upgrade change
• Leave all the function names as they are now (all tests pass)
• Add the update command that only adds __update in the $sub_args, this way we can check if the user used the -u of --upgrade option, notify the deprecation and add the __update flag to trigger the updates.

[danhper]

@enricobacis Great, thank you!