adds travis CI to repo

- adds .travis.yml which controls the travis CI builds for latex

.travis.yml

@@ -0,0 +1,12 @@
+before_install:
+- "sudo apt-get update && sudo apt-get install --no-install-recommends texlive-fonts-recommended texlive-latex-extra texlive-fonts-extra texlive-latex-recommended dvipng"
+script:
+- mkdir _build
+- pdflatex -output-directory _build my-favorite-physicist.tex
+notifications:
+  email:
+    recipients:
+      - latex3-commits@tug.org
+    on_success: change
+    on_failure: always
+    on_start:   never