[travis] scripts update introduced pytest dep.

.travis.yml

@@ -19,6 +19,8 @@ addons:
     - doxygen
     - texlive-base
     - python-virtualenv
+    - python3-pytest
+    - python-pytest
     - libboost1.55-all-dev
     - python-pip
     - libtbb-dev

dune.module

@@ -10,5 +10,5 @@
 Module: dune-gdt
 Version: 0.2-dev
 Maintainer: felix.schindler@wwu.de
-Depends: dune-common (>= 2.2) dune-stuff (>= 2.2)
-Suggests: dune-fem (>= 1.3) dune-pdelab dune-grid-multiscale
+Depends: dune-common (>= 2.4) dune-stuff (>= 2.2)dune-grid
+Suggests: dune-fem (>= 1.3) dune-pdelab dune-grid-multiscale dune-alugrid