remove hiera gem dependency

The Hiera dependency is not required and it buggers up people trying to
use this with Puppet Enterprise packaged Hiera.
Merge pull request #87 from binford2k/remove_hiera_rubygem_dep

remove hiera gem dependency
Set version to 2.0.2
Remove possible RCE in cipher selection
Fix link to hiera-eyaml-plaintext
Merge branch 'snyff-fix-rce-exploit'
Updated version to 2.0.3
Merge pull request #96 from ct-clearhaus/patch-1

Fix link to hiera-eyaml-plaintext
Create temporary .yaml file

Ensure that the temporary file on edit is a yaml file.

It allows editors which are basing their syntax colouring on the extension of the file.
Merge pull request #102 from ColinHebert/patch-1

Create temporary .yaml file
Added documentation for installing hiera-eyaml for the new
puppet-server.
Merge pull request #111 from Conzar/master

Added documentation for installing for new puppet-server