prose to clarify difference between OA and non-selective
table to clarify OA journals selectivity policies
fix csv format
second edit. More constructive.
third edit. Tighter prose.
improve structure
add more journals to csv

do we need some objective list?
made a few minor changes to the wording, particularly in the concluding paragraph
updated csv of oa journals
Merge pull request #1 from roblanf/master

some suggestions from Rob Lanfear