libewf 20140608

Closes #30911.
libewf: update 20140427 bottle.
Improve pull request URL regexp

 - use a regexp literal and avoid escaping forward slashes
 - escape the period in "github.com"
 - match only hex characters in the commit part
 - allow hyphen in usernames and repo names, matching what we allow for
   tap names
 - avoid unnecessary capture
Use if-else instead of postfix unless
xournal 0.4.8
quotes
xournal: add 0.4.8 bottle.