Final cover art; update Thunder tif-stack location

README.md

@@ -5,7 +5,7 @@ Code to accompany [Advanced Analytics with Spark](http://shop.oreilly.com/produc
 by [Sandy Ryza](https://github.com/sryza), [Uri Laserson](https://github.com/laserson), 
 [Sean Owen](https://github.com/srowen), and [Josh Wills](https://github.com/jwills).
 
-![Advanced Analytics with Spark](http://akamaicovers.oreilly.com/images/0636920035091/rc_lrg.jpg)
+![Advanced Analytics with Spark](http://akamaicovers.oreilly.com/images/0636920035091/lrg.jpg)
 
 ### Build
 
@@ -22,6 +22,6 @@ by [Sandy Ryza](https://github.com/sryza), [Uri Laserson](https://github.com/las
 - Chapter 8: http://www.andresmh.com/nyctaxitrips/
 - Chapter 9: (see `ch09-risk/data/download-all-symbols.sh` script)
 - Chapter 10: ftp://ftp-trace.ncbi.nih.gov/1000genomes/ftp/data/HG00103/alignment/HG00103.mapped.ILLUMINA.bwa.GBR.low_coverage.20120522.bam
-- Chapter 11: https://github.com/thunder-project/thunder/tree/master/python/thunder/utils/data/fish/tif-stack
+- Chapter 11: https://github.com/thunder-project/thunder/tree/0.4.1/python/thunder/utils/data/fish/tif-stack
 
 [![Build Status](https://travis-ci.org/sryza/aas.png?branch=master)](https://travis-ci.org/sryza/aas)