Resolve "Fix default parameters for the periodic bubble example"

Closes #25 (closed)

ci/docker_images/ubuntu/bionic/Dockerfile

@@ -103,7 +103,7 @@ RUN  wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
  && echo 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic main'     >> /etc/apt/sources.list \
  && echo 'deb-src http://apt.llvm.org/bionic/ llvm-toolchain-bionic main' >> /etc/apt/sources.list \
  && apt-get update                                                                                 \
- && apt-get install --assume-yes llvm-3.8 clang-3.8 libllvm3.8 libclang-3.8-dev
+ && apt-get install --assume-yes llvm-3.9 clang-3.9 libllvm3.9 libclang-3.9-dev
 
 # Intel OpenCl
 RUN cd /tmp                                                                                 \
@@ -189,7 +189,7 @@ RUN cd /tmp                                       \
  && mkdir pycairo                                 \
  && find /usr/ -name 'pycairo.h' -exec cp {} ./pycairo/pycairo.h \; \
  && CPPFLAGS=-I. ./configure                      \
- && CPPFLAGS=-I. make                             \
+ && CPPFLAGS=-I. make -j16                        \
  && make install                                  \
  && cd -                                          \
  && rm -Rf /tmp/graph-tool-2.26