Enable detached ascii sig for SHA256SUMS.
add extension logos

Signed-off-by: drebs <drebs@leap.se>
Add missing CHANGELOG.
add copyright info
modify makefile to use template
Merge remote-tracking branch 'kalikaneko/add-assets' into develop
Fix makefile and install.rdf template.
Fix items from mozilla review. Closes #4374.
Merge remote-tracking branch 'andrejb/bug/4374_fix-items-from-review' into develop
Fold in changes.
Merge branch 'release-0.0.2'