[zanata/zanata-server] e20498: Add installation documentation.

[GitHub]

  Branch: refs/heads/docs-improvements
  Home:   https://github.com/zanata/zanata-server
  Commit: e20498d395b4835c473d8a9a30e5fd149a6dc0fd
      https://github.com/zanata/zanata-server/commit/e20498d395b4835c473d8a9a30e5fd149a6dc0fd
  Author: Carlos A. Munoz <camunoz at redhat.com>
  Date:   2015-03-12 (Thu, 12 Mar 2015)

  Changed paths:
    A docs/configuration/installation.md
    M mkdocs.yml

  Log Message:
  -----------
  Add installation documentation.