Check input fields for…

* Valid URLs and E-mail Adresse
* @ on Twitter and ADN Account
* Whitespaces at the beginning and the end (they are removed)
Added support for Foursquare to the Social Module
New Features for ADN Module

* Optional Announcement fallback to Podcast Image
* Show Image in Announcement Preview
Added Support for various scientific networks

* ResearchGate
* ORCiD
* Scopus

The icons of the services must be added!
Added Icons
Merge pull request #534 from podlove/scientific-networks

Scientific networks
merge
update readme
New Icons for ORCiD and Scopus
support "duplicate post" plugin

- regenerate guid
- copy contributions

issue #538
Merge pull request #536 from podlove/orcid-scopus-icons

New Icons for ORCiD and Scopus
merge
Merge branch 'foursquare' into release-1-10-23
fix social repair module

fixes #537
rename blog feed expert setting
changed bitlove js inject to support https
Merge branch 'Tak0r-master' into release-1-10-23
update readme
merge upstream & add documentation to check-input
add input checking to contributor fields