Remove PSP build script since it's unmaintaind.
Close #25 .
Remove unnecessary files.
Modernize shinonome ruby script
Merge pull request #217 from Zegeri/shinonome-patch

Modernize shinonome ruby script
Merge pull request #215 from take-cheeze/remove_psp

Remove PSP build script and unnecessary files.
Merge branch 'master' of https://github.com/EasyRPG/Player