Add scripts to `rake test` on all rubies

Run ./multi_test.sh to test all rubies that are configured in
Dockerfile.

Dockerfile

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+FROM ubuntu:latest
+
+RUN apt-get update -y
+RUN apt-get install -y wget make git
+
+RUN wget --no-check-certificate -O ruby-install-0.4.3.tar.gz https://github.com/postmodern/ruby-install/archive/v0.4.3.tar.gz
+RUN tar -xzvf ruby-install-0.4.3.tar.gz
+RUN cd ruby-install-0.4.3 && make install
+
+RUN ruby-install ruby 1.9.3
+RUN ruby-install ruby 2.1.1
+RUN ruby-install ruby 2.1.2
+
+ADD . /pry
+WORKDIR /pry

multi_test.sh

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+#!/bin/bash -e
+
+docker build -t pry/pry .
+docker run -i -t -v /tmp/prytmp:/tmp/prytmp pry/pry ./multi_test_inside_docker.sh

multi_test_inside_docker.sh

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+#!/bin/bash -e
+
+export ORIGINAL_PATH=$PATH
+
+function test {
+  version=$1
+  export PATH=$ORIGINAL_PATH
+
+  export GEM_HOME=/tmp/prytmp/$version
+  export PATH=/opt/rubies/$version/bin:$GEM_HOME/bin:$PATH
+  export RUBY_ROOT=/opt/rubies/$version
+
+  if [ ! -f $GEM_HOME/bin/bundle ]; then
+    gem install bundler --no-rdoc --no-ri
+  fi
+
+  bundle install --quiet
+  rake test
+}
+
+for ruby in `ls /opt/rubies`
+do
+  test $ruby || :
+done