add -w and -f option to start-nginx, to wait for a specific file
remove wait and file options; replace with -f (force) option
update buildpacks to use github for now. Need to host on s3.
Merge pull request #6 from mxk1235/master

provide start-nginx with -f
Remove quotes around "$COMMAND"

Per https://github.com/ryandotsmith/nginx-buildpack/pull/6/files#r4828674
Merge pull request #11 from venables/fix-command

Fix `bundle exec unicorn -c config/unicorn.rb: No such file or directory`