Bump Test::Spelling prereq to 0.17 for windows fix

closes gh-7.
Restrict perlcritic theme to core

to avoid pulling in random (undesired) themes that may be installed
Merge remote-tracking branch 'rwstauner/fix-windows-hang-with-spell17'
ensure test requires appropriately if on windows

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>