reduced compilation warning messages from Pool.hs

Removed unused import, exported spares and cleanup, and start the unused
function name with "_".

Signed-off-by: Atsuro Hoshino <atsuro.hoshino@parsci.com>
reduced warning messages from CCI.hs

Start unused functions and variables with "_", wrap unused do-notation result
with "void".

Signed-off-by: Atsuro Hoshino <atsuro.hoshino@parsci.com>
Merge pull request #12 from ps-labs/minor-warnings

Minor warnings