CI: Use cs50/ppa for astyle 3.0.1

Closes coala#2302
Related to coala#2592

.ci/deps.apt.sh

@@ -4,7 +4,7 @@ set -x
 # apt-get commands
 export DEBIAN_FRONTEND=noninteractive
 
-deps="libclang1-3.4 indent mono-mcs chktex r-base julia golang-go luarocks verilator cppcheck flawfinder devscripts mercurial"
+deps="libclang1-3.4 astyle indent mono-mcs chktex r-base julia golang-go luarocks verilator cppcheck flawfinder devscripts mercurial"
 deps_infer="m4 opam"
 
 case $CIRCLE_BUILD_IMAGE in
@@ -43,6 +43,7 @@ if [ -n "$ADD_APT_UBUNTU_RELEASE" ]; then
 fi
 
 if [ "$USE_PPAS" = "true" ]; then
+  sudo add-apt-repository -y ppa:cs50/ppa
   sudo add-apt-repository -y ppa:marutter/rdev
   sudo add-apt-repository -y ppa:staticfloat/juliareleases
   sudo add-apt-repository -y ppa:staticfloat/julia-deps

.ci/deps.sh

@@ -55,9 +55,3 @@ if [ ! -e ~/phpmd/phpmd ]; then
   sudo chmod +x phpmd.phar
   sudo mv phpmd.phar ~/phpmd/phpmd
 fi
-
-# astyle installation
-wget "https://downloads.sourceforge.net/project/astyle/astyle/astyle%203.0.1/astyle_3.0.1_linux.tar.gz?r=&ts=1499017588&use_mirror=excellmedia" -O ~/astyle.tar.gz
-tar -xvzf ~/astyle.tar.gz -C ~/
-make -C ~/astyle/build/gcc
-sudo make install -C ~/astyle/build/gcc

.travis.yml

@@ -148,7 +148,7 @@ env:
   global:
     - TERM=dumb
     - CIRCLE_NODE_INDEX=-1  # Avoid accidentially being a CircleCI worker
-    - USE_PPAS="marutter/rdev staticfloat/juliareleases ondrej/golang"
+    - USE_PPAS="marutter/rdev staticfloat/juliareleases ondrej/golang cs50/ppa"
     - R_LIB_USER=~/R/Library
     - LINTR_COMMENT_BOT=false
     - PATH="/opt/cabal/1.24/bin:$PATH:$TRAVIS_BUILD_DIR/node_modules/.bin:$TRAVIS_BUILD_DIR/vendor/bin:$HOME/dart-sdk/bin:$HOME/.cabal/bin:$HOME/infer-linux64-v0.7.0/infer/bin:$HOME/pmd-bin-5.4.1/bin:$HOME/bakalint-0.4.0:$HOME/elm-format-0.18:$HOME/.local/tailor/tailor-latest/bin:$HOME/phpmd"