install pylint

Author: Vladimir Kotal

dev/before_install

@@ -6,19 +6,19 @@ if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
 		echo "cannot update"
 		exit 1
 	fi
-	sudo apt-get install -qq cvs git mercurial cssc bzr subversion monotone rcs rcs-blame python3 python3.4-venv python3-pip pep8 nodejs
+	sudo apt-get install -qq cvs git mercurial cssc bzr subversion monotone rcs rcs-blame python3 python3.4-venv python3-pip pep8 nodejs 
 	if [[ $? != 0 ]]; then
 		echo "cannot install extra packages"
 		exit 1
 	fi
 	sudo ./dev/install-bitkeeper.sh
 	sudo pip3 install --upgrade pip
-	sudo pip3 install flake8
+	sudo pip3 install flake8 pylint
 elif [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
 	brew update
 	brew install ctags cvs node
 	brew upgrade python
-	pip3 install pep8 flake8 virtualenv
+	pip3 install pep8 flake8 virtualenv pylint
 fi
 
 sudo ./dev/install-universal_ctags.sh