Improve MAVEN build Performance

[ChenZhangg]

Parallel builds in Maven 3 Maven 3.x has the capability to perform parallel builds.

Apache Maven Dependency Plugin can be used to find unused dependencies. And I found following list. Maybe we can remove them. jsondoc-master jsondoc-core {groupId='org.slf4j', artifactId='slf4j-log4j12'} {groupId='log4j', artifactId='log4j'} {groupId='org.springframework', artifactId='spring-webmvc'} jsondoc-springmvc {groupId='org.springframework', artifactId='spring-webmvc'} {groupId='org.springframework', artifactId='spring-test'} jsondoc-maven-plugin {groupId='org.jsondoc', artifactId='jsondoc-springmvc'} {groupId='org.springframework', artifactId='spring-webmvc'} {groupId='org.apache.commons', artifactId='commons-io'} {groupId='junit', artifactId='junit'} jsondoc-ui jsondoc-ui-webjar {groupId='junit', artifactId='junit'} spring-boot-starter-jsondoc {groupId='org.springframework.boot', artifactId='spring-boot-starter-web'} {groupId='org.springframework.boot', artifactId='spring-boot-configuration-processor'} {groupId='junit', artifactId='junit'}

===================== If there are any inappropriate modifications in this PR, please give me a reply and I will change them.