Fixed incorrect sbtopts lines processing

It used `for` loop which is known to work incorrectly with spaces. This
commit changes it to `while read` loop. This allows more complex options
to be specified in sbtopts files.

Fixes #80

src/universal/bin/sbt

@@ -131,7 +131,7 @@ process_my_args () {
 }
 
 loadConfigFile() {
-  for line in $(cat "$1" | sed '/^\#/d'); do
+  cat "$1" | sed '/^\#/d' | while read line; do
     eval echo $line
   done
 }