Move commands to build script and conditionally create /json directory

.travis.yml

@@ -8,8 +8,5 @@ script:
 after_script:
   - cd build
   - sh build.sh
-  - ls -l ../
-  - ls -l ../json
-  - cat -l ../json/api.json
 notifications:
   email: false

build/build.sh

@@ -1,4 +1,7 @@
 #!/bin/bash
 
+mkdir -p ../json
 node md2json.js ../README.md > ../json/api.json
 cat ../json/api.json
+ls -l ..
+ls -l ../json