update gem tasks + Gemfile.lock

Author: lamont-granquist

Gemfile.lock

@@ -36,7 +36,7 @@ GIT
 PATH
   remote: .
   specs:
-    berkshelf-api (2.1.3)
+    berkshelf-api (2.2.0)
       activesupport (~> 4.0)
       archive (= 0.0.6)
       buff-config (~> 1.0)

tasks/build_gem.rb

@@ -1,25 +1,25 @@
 require 'thor'
+require "bundler/gem_tasks"
 
 class BuildGem < Thor
   require 'thor/rake_compat'
   namespace "gem"
 
   include Thor::RakeCompat
-  Bundler::GemHelper.install_tasks
 
   desc "build", "Build berkshelf-api-#{Berkshelf::API::VERSION}.gem into the pkg directory"
   def build
-    Rake::Task["build"].execute
+    Rake::Task["build"].invoke
   end
 
   desc "install", "Build and install berkshelf-api-#{Berkshelf::API::VERSION}.gem into system gems"
   def install
-    Rake::Task["install"].execute
+    Rake::Task["install"].invoke
   end
 
   desc "release", "Create tag v#{Berkshelf::API::VERSION} and build and push berkshelf-api-#{Berkshelf::API::VERSION}.gem to Rubygems"
   def release
-    Rake::Task["release"].execute
+    Rake::Task["release"].invoke
   end
 
   class Spec < Thor