fix problem with error handling and trunked messages

bancroft.js

@@ -39,7 +39,13 @@ var Bancroft =
         var info = payload.split('\n');
         for ( var index = 0; index < info.length; index++) {
           if (info[index]) {
+            try {
             var data = JSON.parse(info[index]);
+            }
+            catch(error) {
+              emitter.emit('error', {message: "bad message format", cause: info[index], error: error});
+              continue;
+            }
             if (data.class === 'VERSION') {
               emitter.emit('connect', {
                 'release' : data.release,

issues.textile

@@ -0,0 +1,18 @@
+# bad message format
+
+From time to time, message get splits between to poll. Should I look for \r along with \n? 
+
+error! { message: 'bad message format',
+  cause: '{"class":"SKY","tag":"GSV","device":"/dev/ttyUSB0","xdop":2.11,"ydop":1.30,"vdop":3.10,"tdop":2.74,"hdop":2.00,"gdop":4.88,"pdop":3.70,"satellites":[{"PRN":2,"el":36,"az":254,"ss"',
+  error: 
+   { stack: [Getter/Setter],
+     arguments: [],
+     type: 'unexpected_eos',
+     message: [Getter/Setter] } }
+error! { message: 'bad message format',
+  cause: ':45,"used":true},{"PRN":4,"el":81,"az":288,"ss":41,"used":true},{"PRN":10,"el":39,"az":174,"ss":0,"used":false},{"PRN":12,"el":29,"az":313,"ss":39,"used":true},{"PRN":13,"el":5,"az":108,"ss":0,"used":false},{"PRN":17,"el":61,"az":101,"ss":44,"used":true},{"PRN":20,"el":24,"az":47,"ss":0,"used":false},{"PRN":23,"el":12,"az":80,"ss":0,"used":false},{"PRN":27,"el":5,"az":256,"ss":0,"used":false},{"PRN":28,"el":11,"az":165,"ss":0,"used":false}]}\r',
+  error: 
+   { stack: [Getter/Setter],
+     arguments: [ ':' ],
+     type: 'unexpected_token',
+     message: [Getter/Setter] } }

readme.textile

@@ -26,7 +26,7 @@ h3. Location Structure
 h2. Examples
 
 <pre>
-var Bancroft = require('./bancroft.js');
+var Bancroft = require('bancroft');
 
 var bancroft = new Bancroft();
 bancroft.on('connect', function () {
@@ -56,6 +56,11 @@ h3. Requirements
 
 This module assumes you have a working "gps daemon":http://gpsd.berlios.de accessible somewhere reacheable on the network along with a GPS tracking device up and running. This module has been tested with an old dusty Garmin eTrex Legend with a Serial->USB adapter cable using the NMEA data protocol.
 
+h4. Testing gpsd
+
+@$ sudo gpsd -D 2 -n -b -N -P /tmp/gpsd.pid /dev/ttyUSB0@
+@$ gpspipe -w@
+
 h3. Git Clone
 
 @$ git clone git://github.com/pdeschen/bancroft.git@