Update execute-files.sh

Run exec-once files that have not been run before. Closes #764
Created startup-once and startup-always folders for running scripts on every vagrant up.
Added documentation about how to use startup-once and startup-always folders.
delete invocation of set_php5_fpm_sock_group_and_user when hhvm_values['install']==1
Fixed error where {exec-once} folders were run every time
Fix for issue importing sql files into postgres by forcing psql command to run as user postgres. Root user does not have a role by default or access without users credentials.
Merge branch 'patch-1' of https://github.com/nakanaa/puphpet into nakanaa-patch-1
Merge branch 'master' of https://github.com/ikari7789/puphpet into ikari7789-master

Conflicts:
	src/Puphpet/MainBundle/Resources/views/manifest/puphpet/shell/execute-files.sh
Merge branch 'fix-hhvm' of https://github.com/fizz/puphpet into fizz-fix-hhvm
Resets Apache default vhost to true; Updates install location of IP-accessed tools. Fixes #850