Renamed the configuration to loadNpmTasks

"app" isn't especially meaningful in this case, so
keeping the name the same as the grunt API seems
better to me (informed by my own messing up twice, 
thinking that the name was "addNpmTasks")

README.md

@@ -227,18 +227,15 @@ Once that configuration has been done, your tasks will be part of the `run` targ
 
 ### Adding NPM based tasks
 
-To load NPM-based tasks that aren't part of the standard Lineman dependencies, you can add the module names to the `appNpmTasks`
-object in `config/application.js`. Note that these still need to be installed, with `npm install <task> --save` or similar.
+To load NPM-based tasks that aren't part of the standard Lineman dependencies, you can add the module names to the `loadNpmTasks` object in `config/application.js`. Note that these still need to be added to your app's `package.json` dependencies and installed to `node_modules` with `npm install`.
 
 ```javascript
-  appNpmTasks: [
-    "npm_task_to_load"
-  ],
+  loadNpmTasks: ["npm_task_to_load"]
 ```
 
 ### Adding Custom tasks
 
-Lineman will automatically require all files in the `tasks` directory and load them into Grunt. If you have custom tasks, you 
+Lineman will automatically require all files in the `tasks` directory and load them into Grunt. If you have custom tasks, you
 can leave them there and add them to the build as above.
 
 ## Troubleshooting

tasks/load-stuff.coffee

@@ -1,7 +1,7 @@
 fs = require('fs')
 
 module.exports = (grunt) ->
-  appNpmTasks = require(process.cwd() + "/config/application").appNpmTasks ? []
+  loadNpmTasks = require("#{process.cwd()}/config/application").loadNpmTasks || []
   linemanNpmTasks = [
     "grunt-contrib-clean",
     "grunt-contrib-coffee",
@@ -16,12 +16,12 @@ module.exports = (grunt) ->
     "grunt-watch-nospawn"
   ]
 
-  grunt.util._
-    .chain(linemanNpmTasks)
-    .union(appNpmTasks)
-    .each (module) ->
-      if fs.existsSync("node_modules/#{module}")
+  grunt.util._(linemanNpmTasks).
+    chain().
+    union(loadNpmTasks).
+    each (module) ->
+      if fs.existsSync("#{process.cwd()}/node_modules/#{module}")
         grunt.loadNpmTasks(module)
       else
-        grunt.loadTasks(__dirname+"/../node_modules/#{module}/tasks")
+        grunt.loadTasks("#{__dirname}/../node_modules/#{module}/tasks")