Added basic gem framework

.gitignore

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+*.gem
+Gemfile.lock

.rubocop.yml

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+Metrics/LineLength:
+  Max: 120

.travis.yml

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+env:
+  global:
+    - CC_TEST_REPORTER_ID=5cfed40102c670b5c9e509730782b751939ddbe53fc57c317b718f635bab1ce8
+
+language: ruby
+rvm:
+  - 2.2
+  - 2.3
+  - 2.4
+  - 2.5
+
+before_install:
+  - gem update bundler
+
+install:
+  - bundle install --jobs=3 --retry=3
+  - gem install rubocop
+
+before_script:
+  - curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+  - chmod +x ./cc-test-reporter
+  - ./cc-test-reporter before-build
+
+script:
+  - rubocop
+  - bundle exec rspec
+
+after_script:
+  - ./cc-test-reporter after-build --exit-code $TRAVIS_TEST_RESULT

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in grover.gemspec
+gemspec

README.md

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-# grover
+# Grover
+
 A Ruby gem to transform HTML into PDFs using Google Puppeteer

Rakefile

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+#!/usr/bin/env rake
+
+require 'bundler/gem_tasks'
+require 'rspec/core/rake_task'
+
+RSpec::Core::RakeTask.new 'spec'
+
+task default: :spec

grover.gemspec

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+lib = File.expand_path('lib', __dir__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+
+require 'grover/version'
+
+Gem::Specification.new do |spec|
+  spec.name        = 'grover'
+  spec.version     = Grover::VERSION
+  spec.authors     = ['Andrew Bromwich']
+  spec.email       = %w[[email protected]]
+  spec.description = 'A Ruby gem to transform HTML into PDFs using Google Puppeteer/Chromium'
+  spec.summary     = 'A Ruby gem to transform HTML into PDFs wrapper the NodeJS Google Puppeteer project using Chromium'
+  spec.homepage    = 'http://github.com/Studiosity/grover'
+  spec.license     = 'MIT'
+
+  spec.files         = `git ls-files`.split("\n")
+  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+  spec.require_paths = ['lib']
+
+  spec.add_development_dependency 'bundler', '~> 1.3'
+  spec.add_development_dependency 'rake', '~> 12.3'
+  spec.add_development_dependency 'rspec', '~> 3.7'
+  spec.add_development_dependency 'rubocop', '~> 0.53'
+  spec.add_development_dependency 'simplecov', '~> 0.15'
+end

lib/grover/version.rb

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+class Grover
+  VERSION = '0.0.1'.freeze
+end