[zanata/zanata-client] 6e9c1e: docs(installation guide):update installation guide

[GitHub]

  Branch: refs/heads/integration/master
  Home:   https://github.com/zanata/zanata-client
  Commit: 6e9c1ea1d1a387345c24dde609a6660ee9dbc523
      https://github.com/zanata/zanata-client/commit/6e9c1ea1d1a387345c24dde609a6660ee9dbc523
  Author: Alex Eng <aeng at redhat.com>
  Date:   2015-12-11 (Fri, 11 Dec 2015)

  Changed paths:
    R docs/installation/installation.md
    M docs/installation/linux-installation.md
    M docs/installation/osx-installation.md
    M docs/installation/windows-installation.md

  Log Message:
  -----------
  docs(installation guide):update installation guide