Merge pull request #26 from nhannguyen/master

Fix postfix attributes problem
default attribute for smtp_tls_cafile
Update apt cookbook
stop removing repo packages
fix "Skipping the data of table mysql.event"
detecting by init script is better
Merge remote-tracking branch 'nhannguyen/apt'
Add postgis cookbook
Temporary force apt-get update after adding new repo
Merge branch 'postgis' of github.com:nhannguyen/chef-cookbooks into postgis