travis skip installation check

.travis.yml

@@ -13,6 +13,8 @@ addons:
     packages:
       - libgsl-dev # dependency for gsl>copula>zinbwave
 
+install: skip
+
 #install:
 #  - R -e 'install.packages("devtools")'
 #  - R -e 'devtools::install(dependencies = TRUE, upgrade_dependencies = TRUE)'