Let SVN be less verbose

Ghost Userrequested to merge
optimise-svn-fetching into master

The SVN fetching generates many unnecessary lines; so many that CI tools can clip the log (https://travis-ci.org/clean-cloogle/cloogle.org/builds/422202217 - see at the bottom)!

I also changed to use an SVN export instead of checkout (#26 (closed)).

Edited by Ghost User

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