Update `pod init` for 1.0

[Installer] List all found configurations when an unknown one is encountered

Get completely rid of :head version support

[Command::Project] No repo update by default on install

Methods are not properly inherited from contexts while setup and teardown callbacks are inherited. Fix that by calling #temorary_repos_path on the module.

The config doesn't matter here.

Increases code readability.

Use that instead of Project#run_install_with_update

Fix resource bundle build path

The behavior changed drastically with #4146, so that relying on this outside of this class was in most cases wrong.

Targets use since #4146 individual build directories in all cases, not only these.

Validate no duplicate targets in Podfile