Add initial Travis-CI setup

.travis.yml

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+install:
+ - source ./texlive.sh
+
+cache:
+ directories:
+ - /tmp/texlive
+
+script:
+ - texlua build.lua check -H

texlive.profile

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+selected_scheme scheme-infraonly
+TEXDIR /tmp/texlive
+TEXMFCONFIG ~/.texlive/texmf-config
+TEXMFHOME ~/texmf
+TEXMFLOCAL /tmp/texlive/texmf-local
+TEXMFSYSCONFIG /tmp/texlive/texmf-config
+TEXMFSYSVAR /tmp/texlive/texmf-var
+TEXMFVAR ~/.texlive/texmf-var
+option_doc 0
+option_src 0

texlive.sh

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+#!/usr/bin/env sh
+
+# This script is used for testing using Travis
+# It is intended to work on their VM set up: Ubuntu 12.04 LTS
+# As such, the nature of the system is hard-coded
+# A minimal current TL is installed adding only the packages that are
+# required
+
+# See if there is a cached verson of TL available
+export PATH=/tmp/texlive/bin/x86_64-linux:$PATH
+if ! command -v texlua > /dev/null; then
+ # Obtain TeX Live
+ wget http:https://mirror.ctan.org/systems/texlive/tlnet/install-tl-unx.tar.gz
+ tar -xzf install-tl-unx.tar.gz
+ cd install-tl-20*
+
+ # Install a minimal system
+ ./install-tl --profile=../texlive.profile
+
+ cd ..
+fi
+
+# l3build itself and LuaTeX: need for texlua
+tlmgr install l3build luatex
+
+# Required to build plain and LaTeX formats:
+# TeX90 plain for unpacking
+tlmgr install cm etex knuth-lib latex-bin tex tex-ini-files unicode-data \
+ xetex
+
+# Dependencies
+tlmgr install \
+ amsmath \
+ Asana-Math \
+ etoolbox \
+ filehook \
+ fontspec \
+ geometry \
+ graphics \
+ ifluatex \
+ ifxetex \
+ lm-math \
+ lualatex-math \
+ luaotfload \
+ oberdiek \
+ ucharcat \
+ xits
+
+# Keep no backups (not required, simply makes cache bigger)
+tlmgr option -- autobackup 0
+
+# Update the TL install but add nothing new
+tlmgr update --self --all --no-auto-install