Rename environment variable for debug mode

Author: frdmn

README.md

@@ -87,7 +87,7 @@ $ vagrant up
 In case you want to see  `stdout` output of the commands running in the background: 
 
 ```shell
-$ DEBUG=true vagrant up
+$ HOSTKEEPER_DEBUG=true vagrant up
 ```
 
 #### Recompile assets/node modules/bower components
@@ -101,7 +101,7 @@ $ vagrant provision
 Again, in case you want to see `stdout` output of the commands running in the background: 
 
 ```shell
-$ DEBUG=true vagrant up
+$ HOSTKEEPER_DEBUG=true vagrant up
 ```
 
 #### Remove virtual machine

Vagrantfile

@@ -1,5 +1,5 @@
 # Debug mode?
-debugMode = ENV['DEBUG']
+debugMode = ENV['HOSTKEEPER_DEBUG']
 
 # Check if debug mode and set variable with string
 if debugMode