Update docker files for Java 6-8
diff --git a/docker/info.txt b/docker/info.txt
index 8f3d856..aadfdc3 100644
--- a/docker/info.txt
+++ b/docker/info.txt
@@ -11,5 +11,14 @@
cd <snakeyaml>/docker
-docker build --tag=snakeyaml:dev java8
-docker run -it snakeyaml:dev
+Java 8:
+docker build --tag=snakeyaml:java8 java8
+docker run -it snakeyaml:java8
+
+Java 7:
+docker build --tag=snakeyaml:java7 java7
+docker run -it snakeyaml:java7
+
+Java 6:
+docker build --tag=snakeyaml:java6 java6
+docker run -it snakeyaml:java6
diff --git a/docker/java6/Dockerfile b/docker/java6/Dockerfile
new file mode 100644
index 0000000..a7e1e83
--- /dev/null
+++ b/docker/java6/Dockerfile
@@ -0,0 +1,20 @@
+# SnakeYAML
+FROM java:6
+MAINTAINER Andrey Somov <public.somov@gmail.com>
+
+RUN apt-get update && apt-get install -y mercurial
+
+# Install Maven manually to avoid Java 7 installation
+WORKDIR /tmp
+RUN wget http://archive.apache.org/dist/maven/maven-3/3.0.5/binaries/apache-maven-3.0.5-bin.tar.gz
+RUN tar -xzvf apache-maven-3.0.5-bin.tar.gz -C /opt
+ENV M2_HOME /opt/apache-maven-3.0.5
+ENV PATH $PATH:$M2_HOME/bin
+RUN mkdir /projects
+WORKDIR /projects
+RUN hg clone https://bitbucket.org/asomov/snakeyaml
+WORKDIR /projects/snakeyaml
+
+CMD ["mvn", "test"]
+
+
diff --git a/docker/java7/Dockerfile b/docker/java7/Dockerfile
new file mode 100644
index 0000000..a6d9594
--- /dev/null
+++ b/docker/java7/Dockerfile
@@ -0,0 +1,19 @@
+# SnakeYAML
+FROM java:7
+MAINTAINER Andrey Somov <public.somov@gmail.com>
+
+RUN apt-get update && apt-get install -y mercurial
+
+# Install Maven manually to avoid Java 7 installation
+WORKDIR /tmp
+RUN wget http://apache.mirrors.hoobly.com/maven/maven-3/3.3.3/binaries/apache-maven-3.3.3-bin.tar.gz
+RUN tar -xzvf apache-maven-3.3.3-bin.tar.gz -C /opt
+ENV M2_HOME /opt/apache-maven-3.3.3
+ENV PATH $PATH:$M2_HOME/bin
+RUN mkdir /projects
+WORKDIR /projects
+RUN hg clone https://bitbucket.org/asomov/snakeyaml
+WORKDIR /projects/snakeyaml
+
+CMD ["mvn", "test"]
+
