Show message and don't start on unsupported node versions

closes #292
- added engines and enginestrict properties to package.json
- these provide warnings / errors when installing through npm
- added our own check using this info on start, throws a useful error and stops the app if the node version is not supported
- also switched sqlite3 to the latest version and checked it works with various node versions

index.js

@@ -5,6 +5,7 @@ var express = require('express'),
     when = require('when'),
     _ = require('underscore'),
     colors = require("colors"),
+    semver = require("semver"),
     errors = require('./core/server/errorHandling'),
     admin = require('./core/server/controllers/admin'),
     frontend = require('./core/server/controllers/frontend'),
@@ -14,6 +15,7 @@ var express = require('express'),
     I18n = require('./core/shared/lang/i18n'),
     filters = require('./core/server/filters'),
     helpers = require('./core/server/helpers'),
+    packageInfo = require('./package.json'),
 
 // ## Custom Middleware
     auth,
@@ -199,7 +201,19 @@ when.all([ghost.init(), filters.loadCoreFilters(ghost), helpers.loadCoreHelpers(
     ghost.app().listen(
         ghost.config().env[process.env.NODE_ENV || 'development'].url.port,
         ghost.config().env[process.env.NODE_ENV || 'development'].url.host,
-        function() {
+        function () {
+
+            // Tell users if their node version is not supported, and exit
+            if (!semver.satisfies(process.versions.node, packageInfo.engines.node)) {
+                console.log(
+                    "\n !!! INVALID NODE VERSION !!!\n".red,
+                    "Ghost requires node version".red,
+                    packageInfo.engines.node.yellow,
+                    "as defined in package.json\n".red
+                );
+
+                process.exit(-1);
+            }
 
             // Remove once software becomes suitably 'ready'
             console.log(

package.json

@@ -6,6 +6,10 @@
     "start": "node index",
     "test": "grunt validate --verbose"
   },
+  "engines": {
+      "node": ">=0.10.* <0.11.4"
+  },
+  "engineStrict": true,
   "dependencies": {
     "express": "3.1.2",
     "express-hbs": "0.2.0",
@@ -15,13 +19,14 @@
     "moment": "2.0.0",
     "underscore": "1.4.4",
     "showdown": "0.3.1",
-    "sqlite3": "git+https://github.com/developmentseed/node-sqlite3.git#6ae402e",
+    "sqlite3": "2.1.14",
     "bookshelf": "0.1.9",
     "knex": "0.1.7",
     "when": "2.1.1",
     "bcrypt-nodejs": "0.0.3",
     "node-uuid": "1.4.0",
-    "colors": "~0.6.0-1"
+    "colors": "~0.6.0-1",
+    "semver": "2.1.0"
   },
   "devDependencies": {
     "grunt": "~0.4.1",