Create DIN-1505-2 (author-date-german) modified O.W.Barth_Verlag

Citation:
no changes

Bibliography:
-removed smallcaps
-removed publisher
-added full christian names for editors
-changed delimiter to slashes for multiple authors
-added closed french quotes (»«) for titles in books, journals, webpages
-changed delimiter to comma and removed capitalisation for "in:"
-changed retrieved format to full name of months
Update and rename DIN-1505-2 (author-date-german) modified O.W.Barth_Verlag to owbarth-verlag.csl

- Changed title to "owbarth-verlag.csl"
- changed style title to <title>O.W. Barth Verlag (German)</title>
- changed "self" link to <link href="http://www.zotero.org/styles/owbarth-verlag" rel="self"/>
- changed style ID to <id>http://www.zotero.org/styles/owbarth-verlag</id>
Rename dependent/owbarth-verlag.csl to owbarth-verlag.csl

Changed location of file from "styles/dependent/...csl"
to 
"styles/...csl"
Merge pull request #581 from amweber/patch-1

Create DIN-1505-2 (author-date-german) modified O.W.Barth_Verlag