hyperlink and wording fix

Changed AnalyticsTracker to AnalyticsRetriever, since that is what the topic was discussing.
Fixed the bottle.py hyperlink, since it was trying to link relative instead of the bottlepy.org webpage.

Author: rhaarm

examples/analytics/README.md

@@ -73,7 +73,7 @@ Similarly to `AnalyticsTracker`, the `output.py` file defines the "output" side
 of the Analytics service. If you want to extract the events you logged in using
 `AnalyticsTracker`, you'd use the `AnalyticsRetriever` class.
 
-Creating an `AnalyticsTracker` instance is identical to the `AnalyticsTracker`:
+Creating an `AnalyticsRetriever` instance is identical to the `AnalyticsTracker`:
 
 ```python
 from analytics.output import AnalyticsRetriever
@@ -138,7 +138,7 @@ you can see a graph of events over time, properties, etc.
 
 We make use of the excellent open source
 [flot](http://code.google.com/p/flot/) graphing library to render
-our Javascript graphs. We also use the [`bottle.py`](bottlepy.org)
+our Javascript graphs. We also use the [`bottle.py`](http://bottlepy.org)
 micro-web framework.
 
 ## Running the Sample