Create 2 VMs, a server and an agent.

To start both, run `vagrant up`. To start only the server, run `vagrant up
zabbix-server` and for the agent `vagrant up zabbix-agent`.
Added zabbix::_repository for Zabbix official packages

Supports both apt and yum. Set node['zabbix']['major_version'] for the major
version of Zabbix, default is 2.0.
Added zabbix::_repository for Zabbix official packages

Supports both apt and yum. Set node['zabbix']['major_version'] for the major
version of Zabbix, default is 2.0.
Rename service[zabbix_agentd] to service[zabbix-agentd]

Rename service to make the zabbix::agent_package recipe cleaner, but still keep
backwards compatibility with the source install.
Add package install support.

Install zabbix-agent package from the official Zabbix repository.
Set include dir to the default from the package.
Define a VM for source agent, `vagrant up zabbix-src-agent`
Rename service[zabbix_server] to service[zabbix-server]

This is to prepare for zabbix::server_package.rb
Yum cookbook version 3.0.0 introduced breaking changes, depend on earlier versions

yum::epel doesn't exist any more, only LWRPs seem to exist. Depend on an
earlier version than 3.0.0.
Postgres cookbook is borked in 3.3.x for now, depend on 3.2.0. Use earlier yum version.

See https://github.com/hw-cookbooks/postgresql/issues/94
Use earlier yum version as well due to yum::epel not existing in version 3.0.0
of yum cookbook.
Add package support to database provider

The database packages for Zabbix install the SQL files necessary. Set
`package_install` in the arguments if using a package. The paths vary depending
on engine and version, making the `sql_path` argument necessary as well.
Added support for installing `zabbix::database` via packages.

Currently only works on Postgres.
php-fpm is broken on centos for the moment, use the fork until it gets fixed
Add package support for web_nginx

Setting `node['zabbix']['web']['install_package'] = true` will install from
package. This will include the database-specific (mysql or postgres) package
that installs the correct PHP dependencies, including database driver.
Install web from package on nginx.

The username is case-sensitive in 2.2 apparently.
Added package support for web_apache
Correct the paths for configuration files
Fix licensing