Update Travis-CI to R

.Rbuildignore

@@ -1 +1,2 @@
 ^docs$
+^\.\./syberia\.github\.io/docs/packages/director$

.travis.yml

@@ -1,17 +1,21 @@
-language: c
+language: r
+sudo: required
+cache: packages
 dist: trusty
-before_install:
-- curl -OL http://raw.github.com/craigcitro/r-travis/master/scripts/travis-tool.sh
-- chmod 755 ./travis-tool.sh
-- "./travis-tool.sh bootstrap"
-install:
-- "./travis-tool.sh install_deps"
-- "./travis-tool.sh install_r testthat microbenchmark crayon"
-- "./travis-tool.sh install_github robertzk/testthatsomemore"
-- "./travis-tool.sh github_package jimhester/covr"
-script: "./travis-tool.sh run_tests"
-after_failure:
-- "./travis-tool.sh dump_logs"
+r:
+  - oldrel
+  - release
+  - devel
+
+r_github_packages:
+    - robertzk/testthatsomemore
+    - kirillseva/covr
+r_binary_packages:
+    - testthat
+    - microbenchmark
+    - crayon
+    - roxygen2
+
 after_success:
   - "Rscript -e 'library(covr);coveralls()'"
 notifications:
@@ -29,3 +33,7 @@ notifications:
     template:
     - "%{repository}#%{build_number} (%{branch} - %{commit} : %{author}): %{message}
       | Details: %{build_url} | Changes: %{compare_url}"
+
+env:
+    - global:
+        - WARNINGS_ARE_ERRORS=1