Fix early free of irep->filename
Allow mrbc command options to be changed
Add example of modifying mrbc options to add debug info
Fix off by one issue
add comments for mruby-array-ext
Merge pull request #1253 from skandhas/pr-add-comments-for-array-ext

add comments for mruby-array-ext
Merge pull request #1252 from carsonmcdonald/fixfilenames

Fix for issue 1243
mrbc to take multiple files, preserving debug information if -g given; close #1243