Fixed bugs;

• import in cond-expand clause did not work as R7RS requires. #4.
• process run procedure crushed on Linux. #6.

New features;

• change-class has been supported.

Improvements;

• -S option has been added to handle other library suffixes.
• Class object now has 'direct-subclasses' slot.
• R7RS style srfi library names are supported.
• Compiler now eliminate some of referencial transparent expressions if it can.

Internal changes;

• Build process has been changed.

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