Create studia-bas-polish.csl

A style for Bureau of Research journal citation (Studia BAS)
Update studia-bas-polish.csl

- deleted leftover "container2" entry
- updated title of the journal to "Studia BAS" journal
- added link to styleguide
- added ISSN
Update studia-bas-polish.csl

changed: rel="styleguide" to rel="documentation" in URL to documentation
Rename studia-bas-polish.csl to studia-bas.csl

- changed filename: studia-bas-polish.csl -> studia-bas.csl
Update studia-bas.csl
Merge pull request #776 from gbalcerowski/patch-1

Create studia-bas-polish.csl