Add rubocop task; make default run spec & rubocop

Author: kigster

Rakefile

@@ -7,11 +7,19 @@ begin
   require 'rspec/core/rake_task'
   RSpec::Core::RakeTask.new(:spec)
 rescue LoadError => e
-  warn "Error loading task: #{e.message}"
+  warn "Error loading rspec task: #{e.message}"
   exit 1
 end
 
-task default: [:spec]
+begin
+  require 'rubocop/rake_task'
+  RuboCop::RakeTask.new(:rubocop)
+rescue LoadError => e
+  warn "Error loading rubocop task: #{e.message}"
+  exit 1
+end
+
+task default: [:spec, :rubocop]
 
 def shell(*args)
   puts "running: #{args.join(' ')}"
@@ -34,7 +42,7 @@ task permissions: [:clean] do
   shell("find . -type d -exec chmod 755 {} \\;")
   shell("find bin -type f -exec chmod 755 {} \\; 2>/dev/null")
   shell("find exe -type f -exec chmod 755 {} \\; 2>/dev/null")
-  shell("pwd -P && mkdir pkg && chmod -R g+r,o+r pkg")
+  shell("pwd -P && mkdir pkg && chmod -R g+r,g+x,o+r,o+x pkg")
 end
 
 desc 'Builds the gem into the pkg/ folder'