pm4linux-installer 0.1.5

The following changes were made:

- `runasroot` should be able to elevate with both `su` and `sudo`.
- Add a `LICENSE` file to the generated shell script for better legal compliance.
- The installer will no longer ask the user about hunspell integration, this will be automatically done based on the system setup.
- Remove the palemoon init script, users must make configurations via `*/.profile`
- The `compile` script will behave like `make`/`autoconf` and will exit on any error.
- Add a checksum verification to the installer.