bump spring

Gemfile

@@ -222,7 +222,7 @@ group :development do
 
   # Preloading environment
 
-  gem 'spring', '1.2.0'
+  gem 'spring', '1.3.1'
   gem 'spring-commands-rspec', '1.0.2'
   gem 'spring-commands-cucumber', '1.0.1'
 

Gemfile.lock

@@ -558,7 +558,7 @@ GEM
     sinon-rails (1.10.3)
       railties (>= 3.1)
     slop (3.6.0)
-    spring (1.2.0)
+    spring (1.3.1)
     spring-commands-cucumber (1.0.1)
       spring (>= 0.9.1)
     spring-commands-rspec (1.0.2)
@@ -725,7 +725,7 @@ DEPENDENCIES
   simple_captcha2 (= 0.3.2)
   sinatra (= 1.4.5)
   sinon-rails (= 1.10.3)
-  spring (= 1.2.0)
+  spring (= 1.3.1)
   spring-commands-cucumber (= 1.0.1)
   spring-commands-rspec (= 1.0.2)
   test_after_commit (= 0.4.0)

bin/spring

@@ -9,7 +9,7 @@ unless defined?(Spring)
 
   if match = Bundler.default_lockfile.read.match(/^GEM$.*?^    (?:  )*spring \((.*?)\)$.*?^$/m)
     ENV["GEM_PATH"] = ([Bundler.bundle_path.to_s] + Gem.path).join(File::PATH_SEPARATOR)
-    ENV["GEM_HOME"] = ""
+    ENV["GEM_HOME"] = nil
     Gem.paths = ENV
 
     gem "spring", match[1]