increase memory limit, like bin/composer not to run out of ram
Update deps
Merge pull request #42 from glensc/memlimit

increase memory limit, bin/composer not to run out of ram
Make output dir mandatory and document the satis config format, fixes #45 #46
Merge branch 'master' of git://github.com/composer/satis
Update repos.

Signed-off-by: Ben Corlett <bencorlett@me.com>