add newline to bug message
Merge pull request #180 from Garonenur/dw

add newline to bug message
get rid of warnings on Windows
Lua: only use mkstemp() on non-Windows systems
Merge pull request #181 from gordon/windows

fix compilation for Windows
Closes #182.
Minor change in hopes that the stalled Travis build will re-run
Merge pull request #183 from standage/a2q

Closes #182.