removed pdf build to stabilise publishing of gh pages

.travis.yml

@@ -7,13 +7,9 @@ cache:
 node_js:
   - "5.1"
 
-before_install:
-  - sudo -v && wget -nv -O- https://raw.githubusercontent.com/kovidgoyal/calibre/master/setup/linux-installer.py | sudo python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main(install_dir='/usr/local')"
-
 script:
   - gitbook install -v 2.6.7
   - gitbook build -v 2.6.7
-  - gitbook pdf -v 2.6.7 . _book/guidelines.pdf
   - grunt deploy
 
 env:

README.md

@@ -1,7 +1,7 @@
 #Developing Restful APIs: A Comprehensive Set of Guidelines by Zalando
 
 [![Build Status](https://travis-ci.org/zalando/restful-api-guidelines.svg?branch=master)](https://travis-ci.org/zalando/restful-api-guidelines)
-Latest published version: **[HTML](http://zalando.github.io/restful-api-guidelines) | [PDF](http://zalando.github.io/restful-api-guidelines/guidelines.pdf)** (only to provide easy way of single-page search)
+Latest published version: **[HTML](http://zalando.github.io/restful-api-guidelines)**
 
 Purpose
 -------