Added curl CURLOPT_NOBODY option in geturl function to ensure the HEAD method is used when resolving permanent/temporary URL moves.
mail plugin: only mail unique articles
mailto plugin: only mail unique articles
mail plugin: cleanup disabled completion, add configurable destination email list
mail plugin: destination dropdown css fix
Merge remote-tracking branch 'upstream/master'
Merge pull request #388 from dzaikos/fix-curl-head-request-method

Fixed geturl() function to ensure HEAD request method is used.
Update schema for size support of enclosures
Store size of enclosure to database
Add width/height attribute to image enclosures
Merge branch 'tribut-enclosure-size'
fix sharebyurl identifying articles by link instead of special synthesized guid which caused feed entries overwriting shared entries if their link matched
Merge remote-tracking branch 'upstream/master'
rebase translations
Merge remote-tracking branch 'upstream/master'
release 1.13
updated german translation
Merge pull request #391 from HeikoAdams/master

updated german translation
Update messages.po
Merge pull request #392 from Trottel/patch-1

Update messages.po