Temporarily clone Netpbm for testing purposes

Author: timholy

.travis.yml

@@ -9,6 +9,7 @@ notifications:
   email: false
 script:
     - if [[ -a .git/shallow ]]; then git fetch --unshallow; fi
+    - julia -e 'Pkg.clone("https://github.com/JuliaIO/Netpbm.jl.git")'
     - julia -e 'Pkg.clone(pwd()); Pkg.build("FileIO"); Pkg.test("FileIO"; coverage=true)'
 after_success:
   - julia -e 'cd(Pkg.dir("FileIO")); Pkg.add("Coverage"); using Coverage; Coveralls.submit(process_folder()); Codecov.submit(process_folder())'