Remove executables from gemspec

We actually put our binstubs in bin, and they're not executable. This
confused RubyGems.

Author: Prem Sichanugrist

codeclimate-services.gemspec

@@ -14,7 +14,6 @@ Gem::Specification.new do |spec|
   spec.license       = "MIT"
 
   spec.files         = `git ls-files`.split($/)
-  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"]