redundant sed(1) gone

* don't introduce commas just to remove them
* there are no double quotes in the data
list_repos made redundant by IFS

the sed in list_repos was necessary because `echo "$foo"` preserves
newlines in $foo, and fold(1) does not join short lines.
OTOH, `echo $foo` runs Field Splitting on $foo using $IFS, which
includes LF by default.

http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05
Merge pull request #9 from roman-neuhauser/list_repos

list_repos gone