Cleanup whitespace

lib/execjs/johnson_runtime.rb

@@ -5,7 +5,7 @@ module ExecJS
     class Context < Runtime::Context
       def initialize(runtime, source = "")
         source = encode(source)
-        
+
         @runtime = Johnson::Runtime.new
         @runtime.evaluate(source)
       end

lib/execjs/ruby_racer_runtime.rb

@@ -94,7 +94,7 @@ module ExecJS
     def name
       "therubyracer (V8)"
     end
-    
+
     def available?
       require "v8"
       true

lib/execjs/ruby_rhino_runtime.rb

@@ -78,7 +78,7 @@ module ExecJS
     def name
       "therubyrhino (Rhino)"
     end
-    
+
     def available?
       require "rhino"
       true

lib/execjs/runtime.rb

@@ -12,7 +12,7 @@ module ExecJS
       def exec(source, options = {})
         raise NotImplementedError
       end
-      
+
       def eval(source, options = {})
         raise NotImplementedError
       end
@@ -25,7 +25,7 @@ module ExecJS
     def name
       raise NotImplementedError
     end
-    
+
     def context_class
       self.class::Context
     end