add %verify-script
replace deprecated string-to-int
fix compilation warnings due to variable scoping
use `with-current-buffer' to avoid compilation warning
call rpm-insert-group interactively to avoid compilation warning

Warning was "rpm-insert-group being defined to take 1 arg, but was
previously called with 0"
avoid compilation warning for set-keymap-name
prevent %pre etc. being highlighted in comments
add myself to contributor list
Merge pull request #1 from aspiers/master

compilation fixes and other misc tweaks