Debug typescript install

package.json

@@ -36,7 +36,7 @@
     "style-loader": "^0.13.0",
     "tsconfig-cli": "^0.1.1",
     "typedoc": "^0.3.11",
-    "typescript": "~1.7.0",
+    "typescript": "^1.7.0",
     "watch": "^0.17.1",
     "webpack": "^1.12.9"
   },

scripts/travis_install.sh

@@ -1,2 +1,4 @@
 #!/bin/bash
+set -ex
+npm install typescript
 npm install