Get rid of the now-redundant Literal#{space,comma} methods.
Fix a list parsing bug.
Fix a list conversion bug.

Closes #699
Fix a bug where multiple spaces in a string literal would sometimes be folded together.

Closes #686
Don't open a file for writing until we have something to write to it.

Closes #704
Always return nil in case of errors in cache store/retrieve.

Closes #705
Merge remote-tracking branch 'origin/stable' into stable