Replaced all license headers with unified layout
max_connections is an integer field, not string

Currently the WebUI shows a warning complaining that e.g. 100 is not an
integer when trying to save the proposal with a different value. So the
max_connections attribute can not be changed.
Merge pull request #90 from tboerger/feature/license-header

Replaced all license headers with unified layout
Merge pull request #91 from mapleoin/max-con-integer

max_connections is an integer field, not string
update postgresql cookbook to 3.4.0
max_connections attribute moved in the chef cookbook

The attribute is now (upstream postgresql >3 cookbook):
node['postgresql']['config_pgtune']['max_connections'], it used to be
node['postgresql']['max_connections']