Moves gem list into gemspec

Gemfile

@@ -1,29 +1,3 @@
 source 'https://rubygems.org'
 
-# Specify your gem's dependencies in diametric.gemspec
 gemspec
-
-gem 'rake'
-
-group :development, :test do
-  gem 'rspec'
-  gem 'pry'
-end
-
-group :development do
-  gem 'guard'
-  gem 'guard-rspec'
-  gem 'rb-inotify', :require => false
-  gem 'rb-fsevent', :require => false
-  gem 'rb-fchange', :require => false
-end
-
-platform :mri do
-  gem 'yard', :group => :development
-  gem 'redcarpet', :group => :development
-end
-
-platform :jruby do
-  gem 'lock_jar'
-  gem 'jruby-openssl'
-end