NO_PRY -> DISABLE_PRY for consistency

Thanks @rking

lib/pry/commands/disable_pry.rb

@@ -1,6 +1,6 @@
 class Pry
   Pry::Commands.create_command "disable-pry" do
-    group 'Navigating pry'
+    group 'Navigating Pry'
     description 'Stops all future calls to pry and exits the current session.'
 
     banner <<-BANNER
@@ -17,7 +17,7 @@ class Pry
     BANNER
 
     def process
-      ENV['NO_PRY'] = 'true'
+      ENV['DISABLE_PRY'] = 'true'
       _pry_.run_command "exit"
     end
   end

lib/pry/pry_class.rb

@@ -123,7 +123,7 @@ class Pry
   # @example
   #   Pry.start(Object.new, :input => MyInput.new)
   def self.start(target=toplevel_binding, options={})
-    return if ENV['NO_PRY']
+    return if ENV['DISABLE_PRY']
     target = Pry.binding_for(target)
     initial_session_setup
 

test/test_commands/test_disable_pry.rb

@@ -6,7 +6,7 @@ describe "disable-pry" do
   end
 
   after do
-    ENV.delete 'NO_PRY'
+    ENV.delete 'DISABLE_PRY'
   end
 
   it 'should quit the current session' do
@@ -15,11 +15,11 @@ describe "disable-pry" do
     }.should.throw(:breakout)
   end
 
-  it "should set NO_PRY" do
-    ENV['NO_PRY'].should == nil
+  it "should set DISABLE_PRY" do
+    ENV['DISABLE_PRY'].should == nil
     lambda{
       @t.process_command 'disable-pry'
     }.should.throw(:breakout)
-    ENV['NO_PRY'].should == 'true'
+    ENV['DISABLE_PRY'].should == 'true'
   end
 end

test/test_pry.rb

@@ -20,13 +20,13 @@ describe Pry do
     end
   end
 
-  describe 'NO_PRY' do
+  describe 'DISABLE_PRY' do
     before do
-      ENV['NO_PRY'] = 'true'
+      ENV['DISABLE_PRY'] = 'true'
     end
 
     after do
-      ENV.delete 'NO_PRY'
+      ENV.delete 'DISABLE_PRY'
     end
 
     it 'should not binding.pry' do