bears/c_languages: Add ArtisticStyleBear

Closes #388

Author: yash-nisar

.ci/deps.sh

@@ -55,3 +55,9 @@ 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