Use org-ruby master instead of packaged by debian

Because there are too many commits between the master branch and the tag which the package points.

Dockerfile

@@ -7,7 +7,7 @@ RUN mkdir /app
 COPY . /app
 WORKDIR /app
 
-RUN DEPS="git ruby ruby-bundler rake ruby-rugged ruby-org ruby-nokogiri" && \
+RUN DEPS="git ruby ruby-bundler rake ruby-rugged ruby-nokogiri" && \
     apt-get update -qq && \
     apt-get install --no-install-recommends --no-install-suggests -y $DEPS && \
     bundle install --jobs 4

Gemfile

@@ -1,4 +1,6 @@
 source 'https://rubygems.org'
 
+gem 'org-ruby', git: 'https://github.com/wallyqs/org-ruby'
+
 # Specify your gem's dependencies in nwiki.gemspec
 gemspec

nwiki.gemspec

@@ -31,6 +31,8 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake",    "= 10.5.0" # rake          https://packages.debian.org/stretch/rake
 
   spec.add_dependency "rugged",   "= 0.24.0"            # ruby-rugged   https://packages.debian.org/stretch/ruby-rugged
-  spec.add_dependency "org-ruby", "= 0.9.12"            # ruby-org      https://packages.debian.org/stretch/ruby-org
   spec.add_dependency "nokogiri", "= 1.6.8.1"           # ruby-nokogiri https://packages.debian.org/stretch/ruby-nokogiri
+  # It can't use ruby-org package in the debian.
+  # Because there are too many commits between the master branch and the tag which the package points.
+  spec.add_dependency "org-ruby", "~> 0.9"
 end