Add some lint checks.

grunt-config/flake8.js

@@ -0,0 +1,5 @@
+module.exports = {
+    src: [
+        'accountant/**/*.py'
+    ]
+}

grunt-config/htmllint.js

@@ -0,0 +1,9 @@
+module.exports = {
+    frontend: {
+      options: {},
+      src: [
+        'accountant/frontend/templates/**/*.html',
+        'accountant/frontend/static/templates/**/*.html'
+      ]
+    }
+}

grunt-config/watch.js

@@ -5,7 +5,18 @@ module.exports = {
     },
     js: {
         files: '<%= paths.frontend_js %>',
-        tasks: ['devjs']
+        tasks: ['jsdev']
+    },
+    py: {
+        files: 'accountant/**/*.py',
+        tasks: ['pydev']
+    },
+    html: {
+        files: [
+            'accountant/frontend/templates/**/*.html',
+            'accountant/frontend/static/templates/**/*.html'
+        ],
+        tasks: ['htmldev']
     },
     gruntfile: {
         files: ['Gruntfile.js']