Only run the "installation" tests both with and without curl.
diff --git a/.travis.yml b/.travis.yml
index 313622f..d3491ce 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,25 +10,15 @@
   - NVM_DIR=$TRAVIS_BUILD_DIR make TEST_SUITE=$TEST_SUITE URCHIN=/tmp/urchin $SHELL
 env:
   - SHELL=sh TEST_SUITE=fast
-  - SHELL=sh TEST_SUITE=fast WITHOUT_CURL=1
   - SHELL=dash TEST_SUITE=fast
-  - SHELL=dash TEST_SUITE=fast WITHOUT_CURL=1
   - SHELL=bash TEST_SUITE=fast
-  - SHELL=bash TEST_SUITE=fast WITHOUT_CURL=1
   - SHELL=zsh TEST_SUITE=fast
-  - SHELL=zsh TEST_SUITE=fast WITHOUT_CURL=1
   - SHELL=ksh TEST_SUITE=fast
-  - SHELL=ksh TEST_SUITE=fast WITHOUT_CURL=1
   - SHELL=sh TEST_SUITE=slow
-  - SHELL=sh TEST_SUITE=slow WITHOUT_CURL=1
   - SHELL=dash TEST_SUITE=slow
-  - SHELL=dash TEST_SUITE=slow WITHOUT_CURL=1
   - SHELL=bash TEST_SUITE=slow
-  - SHELL=bash TEST_SUITE=slow WITHOUT_CURL=1
   - SHELL=zsh TEST_SUITE=slow
-  - SHELL=zsh TEST_SUITE=slow WITHOUT_CURL=1
   - SHELL=ksh TEST_SUITE=slow
-  - SHELL=ksh TEST_SUITE=slow WITHOUT_CURL=1
   - SHELL=sh TEST_SUITE=installation
   - SHELL=sh TEST_SUITE=installation WITHOUT_CURL=1
   - SHELL=dash TEST_SUITE=installation