Remove '-p' option of 'type' builtin command in shell scripts.

That option may be unsupported in some POSIX-complete shells.
Add commandline option --version
Merge branch 'get_version' of https://github.com/anwa/etckeeper
comment
changelog
initial commit
website
Merge branch 'master' of ssh://etckeeper.branchable.com
move
website
reword
update
unify installs