use development version of spectral cube

.travis.yml

@@ -92,7 +92,7 @@ install:
     # packages. You should leave the `numpy=$NUMPY_VERSION` in the `conda`
     # install since this ensures Numpy does not get automatically upgraded.
     - if [[ $SETUP_CMD != egg_info ]]; then $CONDA_INSTALL numpy=$NUMPY_VERSION matplotlib scipy ; fi
-    - if [[ $SETUP_CMD != egg_info ]]; then $PIP_INSTALL spectral-cube; fi
+    - if [[ $SETUP_CMD != egg_info ]]; then $PIP_INSTALL git+http://github.com/radio-astro-tools/spectral-cube.git#egg=spectral-cube; fi
 
     # DOCUMENTATION DEPENDENCIES
     # build_sphinx needs sphinx and matplotlib (for plot_directive). Note that