Do not retry on write timeouts

This is causing problems due to silent failure/servers not dying when
told. Will fix properly when we rework error handling.
Whitespace
Don't retry contents updates either

Like writes, this will be fixed properly when Marquise error handling is
reworked.
Merge pull request #49 from anchor/dont-retry

Don't retry on write/contents update timeouts
Merge branch 'master' into error

Conflicts:
	lib/Marquise/IO/Writer.hs
	lib/Marquise/Server.hs
	marquise.cabal