change some BufRead autocommands to FileType

I realized that that was what I really wanted
add autocommand to read .sscm as Scheme

That’s the file extension for Sweet Scheme, which is Scheme that uses Sweet-Expressions.
make autocommand whitespace consistent

have two spaces always separate the pattern from the command, since the command can be complex and stands alone in that it could be run by itself
Merge branch 'master' of github.com:roryokane/dotvim