Add a Travis CI config

Add an initial Travis CI configuration file. Currently, the output is
not deployed anywhere, so it's just pass/fail for the building of pdf
and html. The CI build is here:

https://travis-ci.org/devicetree-org/devicetree-specification

Reviewed-by: Stephen Boyd <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

Author: robherring

.travis.yml

@@ -0,0 +1,32 @@
+sudo: false
+dist: trusty
+
+cache:
+  apt: true
+
+env:
+  global:
+      - SPHINXBUILD=~/.local/bin/sphinx-build
+
+addons:
+  apt:
+    packages:
+      - python-pip
+      - latexmk
+      - latexdiff
+      - texlive
+      - texlive-latex-extra
+      - texlive-humanities
+      - texlive-generic-recommended
+      - graphviz
+      - texlive-generic-extra
+
+install:
+  - pip install --user mako
+  - pip install --user Sphinx
+
+script:
+  - make latexpdf
+  - make html
+  - make singlehtml
+

README.md

@@ -8,7 +8,7 @@ This [repository](https://github.com/devicetree-org/devicetree-specification) ho
    * Use this mailing list for submitting patches, questions and general discussion
    * Sign up to the mailing list at http://vger.kernel.org/vger-lists.html#devicetree-spec
 
-## Build Instructions ##
+## Build Instructions [![Build Status](https://travis-ci.org/devicetree-org/devicetree-specification.svg)](https://travis-ci.org/devicetree-org/devicetree-specification) ##
 
 Requirements:
 * Sphinx: http://sphinx-doc.org/contents.html