Merge branch 'master' of https://github.com/b3log/solo

Dockerfile

-FROM maven:3.2-jdk-7-onbuild
+FROM maven:3
 MAINTAINER Liang Ding <dl88250@gmail.com>
 
 ADD . /solo
@@ -7,3 +7,5 @@ RUN mvn install
 WORKDIR /solo/target/solo
 
 EXPOSE 8080
+
+CMD ["/bin/sh", "-c", "java -cp WEB-INF/lib/*:WEB-INF/classes org.b3log.solo.Starter"]
\ No newline at end of file

pom.xml

@@ -282,8 +282,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${maven-compiler-plugin.version}</version>
                 <configuration>
-                    <source>1.7</source>
-                    <target>1.7</target>
+                    <source>1.8</source>
+                    <target>1.8</target>
                     <encoding>UTF-8</encoding>
                 </configuration>
             </plugin>