Get correct GnuTLS version in travis

.travis.yml

@@ -2,8 +2,11 @@ language:
  - c++
  - java
 
-# Travis is still stuck on Ubuntu 14.04, which has a too old FLTK
+# Travis is still stuck on Ubuntu 14.04, which has too old crap
 before_install:
+# GnuTLS 3.x
+ - sudo apt-get install -y libgnutls28-dev
+# FLTK 1.3.4
  - wget http://fltk.org/pub/fltk/1.3.4/fltk-1.3.4-2-source.tar.gz
  - tar -xvf fltk-1.3.4-2-source.tar.gz
  - pushd fltk-1.3.4-2