switch to vcs2l (#630)

* switch to vcs2l

Author: tfoote

README.md

@@ -25,7 +25,7 @@ and uses client-side javascript for quick searching and visualization.
 sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
 apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
 sudo apt-get update
-sudo apt-get install curl git git-svn mercurial nodejs pandoc python3-vcstool
+sudo apt-get install curl git git-svn mercurial nodejs pandoc python3-vcs2l
 ```
 
 ##### Ruby 2.2 via RVM

docker/image/Dockerfile

@@ -28,7 +28,7 @@ RUN apt-get update && \
         pandoc \
         pkg-config \
         python3-pip \
-        python3-vcstool \
+        python3-vcs2l \
         ruby \
         ruby-dev \
         rubygems-integration && \