[kudu-CR](gh-pages) Update Jekyll and site-tool

["Attila Bukor (Code Review)" <ge...@cloudera.org>]

Hello Alexey Serbin, Grant Henke, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/16256

to look at the new patch set (#2).

Change subject: Update Jekyll and site-tool
......................................................................

Update Jekyll and site-tool

site_tool fails to publish the site on Python 3 due to shell exec
returning bytes instead of string and calling strip() on it. This patch
decodes these bytes as UTF8 strings.

This patch also updates Jekyll as the previous version doesn't run on
modern Ruby version.

Change-Id: Iebab0334b1c88e5fcfa4fee5b361e6ade314e407
---
M .gitignore
M Gemfile
M Gemfile.lock
M _config.yml
M _includes/top_common.html
M site_tool
6 files changed, 99 insertions(+), 111 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/56/16256/2
-- 
To view, visit http://gerrit.cloudera.org:8080/16256
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Gerrit-Project: kudu
Gerrit-Branch: gh-pages
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Iebab0334b1c88e5fcfa4fee5b361e6ade314e407
Gerrit-Change-Number: 16256
Gerrit-PatchSet: 2
Gerrit-Owner: Attila Bukor <ab...@apache.org>
Gerrit-Reviewer: Alexey Serbin <as...@cloudera.com>
Gerrit-Reviewer: Grant Henke <gr...@apache.org>