Create Environmental-chemistry

Style for the Environmental Chemistry journal, as described in:
http://www.publish.csiro.au/nid/192/aid/2320.htm#22
Briefly, is the Vancouver - superscript - brackets style, with:
Article/book title in italics.
Year in bold
Volume italics, no issue
Full page range: pp 125-150, etc.

Validated
Update Environmental-chemistry
Rename Environmental-chemistry to environmental-chemistry

Done! Sorry by forgotting that
Rename environmental-chemistry to environmental-chemistry.csl
Merge pull request #769 from fvmolina/patch-1

Create Environmental-chemistry