Set default tab width to 2 for vi editor only for these two files.

.travis.yml

@@ -66,3 +66,5 @@ script: rake travis_ci
 after_success:
     - bash -c "[ $SITE_UPDATE_ON_MASTER_COMMIT ]" && rake travis_ci_site_update && rake travis_ci_rebase
     - bash -c "[ $PACKAGE_UPLOAD ]" && rake travis_ci_package_upload
+
+# vi: set ts=2 sw=2 expandtab:

Rakefile

@@ -349,3 +349,5 @@ RLq28S11hDrKf/ZetXNuIprfTlhl6ISBy+oWQibhXmFZSxEiXNV6hCQ=
 EOF" or abort 'Failed to create user private key to id_rsa'
   system 'chmod 600 ~/.ssh/id_rsa' or abort 'Failed to change id_rsa file permission'
 end
+
+# vi: set ts=2 sw=2 expandtab: