Fixed link to Ace editor
The other link gave me error. This works well
Adding empty guide
Simple getting started tutorial on postgresql.
Small fix
PostgreSQL category added.
Merge pull request #9 from FedericoPonzi/master

Small fixes and a tutorial on PostgreSQL
fixed a typo on the title
Merge pull request #10 from sinan/master

fixed a typo on the title on Setting up a framework webserver guide
Merge branch 'pageheadermargin'
Merge branch 'basiccodepretty'
Merge branch 'master' of github.com:koding/kdlearn
Added the cd .metalsmith command, to be consistent
Added a note on how to preview, with a link to the build instructions
Merge branch 'buildinstructionsincontrib' into develop