[WIP] Specify the `peco` key bindings.
Adding `peco` configuration file.

- Assign `C-j` to `peco.Finish`.
- Specify the style configuration.
Copying the `peco` configuration file as a soft link.
Refactor the installation script.

- Modify the variable reference from `$variable` to `${variable}`.
- Exclude the vim swap file from the copy list.
Merge pull request #18 from kazu634/peco-keybind

Specify the `peco` key bindings.