Merge pull request #27 from lammpstutorials/add-tutorial8

Added tutorial 8

Author: simongravelle

.gitignore

@@ -1,4 +1,4 @@
-# To be remove when final version is published
+# To be removed when final version is published
 lammps-tutorials.pdf
 
 # LaTex files for the manuscript
@@ -33,4 +33,5 @@ _region_.*
 # LAMMPS output files
 dump.*.jpg
 dump.*.ppm
+dump.*.ppm
 myimage-*.ppm