Add `.travis.yml` configuration file to support travis building

.travis.yml

@@ -0,0 +1,30 @@
+language: r
+sudo: false
+cache: packages
+
+r:
+ - oldrel
+ - release
+ - devel
+
+addons:
+  apt:
+    packages:
+      - libhunspell-dev
+
+# We want to use devel devtools to load packages so we can catch package
+# installation issues sooner rather than later.
+r_github_packages:
+  - hadley/devtools
+
+# We need to install BiocInstaller for testing Bioconductor packages
+bioc_required: true
+
+# Set CXX1X for R-devel, as R-devel does not detect CXX1X support for gcc 4.6.3,
+# this was causing hunspell installation to fail
+before_install:
+  - if [[ "$TRAVIS_R_VERSION_STRING" = 'devel' ]]; then mkdir ~/.R && echo 'CXX1X=g++ -std=c++0x -g -O2 -fPIC' > ~/.R/Makevars; fi
+
+# Only report coverage for the release version
+after_success:
+- test $TRAVIS_R_VERSION_STRING = 'release' && Rscript -e 'covr::codecov()'