don't build figures either. attempt to make documentation failures properly reported on travis

.travis.yml

@@ -73,7 +73,10 @@ install:
 
 script:
 # disable invoking docutils for now, until we can have a modern version of it
-  - if [[ $docs == "1" && $TRAVIS_OS_NAME == "linux" ]]; then cd docs; make rst RST2HTML=rst2html; cd ..; fi
+  - cd docs
+  - if [[ $docs == "1" && $TRAVIS_OS_NAME == "linux" ]]; then make rst RST2HTML=rst2html; fi
+  - cd ..
+
   - cd test
   - bjam --hash -j3 warnings-as-errors=on variant=$variant -l900 $coverage_toolset $target
 # if we're building with code coverage, report it as soon as possible
@@ -96,10 +99,10 @@ script:
   - LD_LIBRARY_PATH=../../lib DYLD_LIBRARY_PATH=../../lib python test.py
   - cd ../..
 
+  - cd simulation
   - if [ $sim = "1" ]; then
-    cd simulation;
     bjam --hash -j2 crypto=built-in $coverage_toolset;
-    cd ..;
     fi
+  - cd ..
   - ccache --show-stats
 

docs/makefile

@@ -55,7 +55,7 @@ FIGURES = \
 	disk_cache \
 	troubleshooting
 
-rst: $(TARGETS:=.rst) $(FIGURES:=.png) todo.html
+rst: $(TARGETS:=.rst) todo.html
 
 html: $(TARGETS:=.html) $(FIGURES:=.png) todo.html