Plugin support

- Homebridge is now designed to be `npm install`d globally and
executed via "homebridge" script
  - Remove all specific accessories/platforms except for an example
  - New internal structure and "cli"

lib/logger.js

@@ -0,0 +1,64 @@
+var chalk = require('chalk');
+
+'use strict';
+
+module.exports = {
+  Logger: Logger,
+  setDebugEnabled: setDebugEnabled,
+  _system: new Logger() // system logger, for internal use only
+}
+
+var DEBUG_ENABLED = false;
+
+// Turns on debug level logging
+function setDebugEnabled(enabled) {
+  DEBUG_ENABLED = enabled;
+}
+
+// global cache of logger instances by plugin name
+var loggerCache = {};
+
+/**
+ * Logger class
+ */
+
+function Logger(pluginName) {
+  this.pluginName = pluginName;
+}
+
+Logger.prototype.debug = function(msg) {
+  if (DEBUG_ENABLED)
+    this.log('debug', msg);
+}
+  
+Logger.prototype.info = function(msg) {
+  this.log('info', msg);
+}
+
+Logger.prototype.warn = function(msg) {
+  this.log('warn', msg);
+}
+
+Logger.prototype.error = function(msg) {
+  this.log('error', msg);
+}
+  
+Logger.prototype.log = function(level, msg) {
+  
+  if (level == 'debug')
+    msg = chalk.gray(msg);
+  else if (level == 'warn')
+    msg = chalk.yellow(msg);
+  else if (level == 'error')
+    msg = chalk.bold.red(msg);
+  
+  // prepend plugin name if applicable
+  if (this.pluginName)
+    msg = chalk.cyan("[" + this.pluginName +  "]") + " " + msg;
+    
+  console.log(msg);
+}
+  
+Logger.forPlugin = function(pluginName) {
+  return loggerCache[pluginName] || (loggerCache[pluginName] = new Logger(pluginName));
+}