add pubsubhubbub support to feed contacts
remove unneeded logger function
uexport: fix full export
- add new line after each valid json line
- export table row as single json object
Merge pull request #721 from fabrixxm/master

uexport: fix full export
PL: update to the strings
ZH_CN: update to the strings
DE: update to the strings
CS: update to the strings
NL: translation added from transifex
Merge pull request #720 from fabrixxm/feed_push

Feed PuSH
Merge branch 'friendica-master'