MRI: add $RGSS_SCRIPTS
MRI: don't manually peform GC
MRI: fix $RGSS_SCRIPTS
MRI: don't set $0 (see #24)
MRI: rewrite script eval

 - set __FILE__ (RGSS 1 and 2)
 - set Ruby string encoding to UTF-8
   instead of using a magic comment
MRI: less `strlen` calls, use custom script's filename
MRI: add option to use a script's name as filename
Merge pull request #24 from cremno/mri-rewrite-script-eval

MRI: rewrite script eval