Merge pull request #260 from aplanas/master

Fix one issue, and try to make the checkrepo to continue when an exception happends
repo-checker: fall back to i586 for disturl checker if x86_64 is not available
add readme for factory news
Merge pull request #263 from lnussel/master

add readme for factory news
Merge pull request #262 from DimStar77/master

repo-checker: fall back to i586 for disturl