Modified the "before_install" field to install all texlive packages needed.

.travis.yml

@@ -4,7 +4,16 @@ branches:
   only:
     - master
 before_install:
-  - sudo apt-get -qq update && sudo apt-get install -y --no-install-recommends texlive-full
+  - sudo apt-get -qq update
+  - sudo apt-get install -y --no-install-recommends texlive 
+  - sudo apt-get install -y --no-install-recommends texlive-bibtex-extra
+  - sudo apt-get install -y --no-install-recommends texlive-fonts-extra
+  - sudo apt-get install -y --no-install-recommends texlive-lang-english
+  - sudo apt-get install -y --no-install-recommends texlive-lang-german
+  - sudo apt-get install -y --no-install-recommends texlive-latex-extra
+  - sudo apt-get install -y --no-install-recommends texlive-math-extra
+  - sudo apt-get install -y --no-install-recommends texlive-publishers
+  - sudo apt-get install -y --no-install-recommends texlive-science
 script:
   - pdflatex -interaction=nonstopmode -halt-on-error thesis.tex
   - test -f thesis-blx.bib && ( bibtex thesis; pdflatex thesis.tex )