Move the other CI script to script/ci/

Author: jtgeibel

.travis.yml

@@ -28,7 +28,7 @@ env:
     - PERCY_PROJECT=crates-io/crates.io
 
 install:
-  - script/cargo-clean-on-new-rustc-version.sh
+  - script/ci/cargo-clean-on-new-rustc-version.sh
   - cargo install --force diesel_cli --vers `cat .diesel_version` --no-default-features --features postgres && export PATH=$HOME/.cargo/bin:$PATH
 
 before_script: