Rename pass executable variable
Remove nils from run argument list
Implement pass command wrapper functions
Move s-chomp to run function
Add recursive option to remove, remove force option

Optional force does not make sense for non-interactive remove function.
password-length is already a number
Add (provide 'password-store) to end of package
Use APG instead of pwgen for password generation

APG offers a nice "pronounceable" password generation option, and I'd like to
use it with password-store.