Javadoc fails when building with Java 8

[isido]

Apparently javadoc behaviour is stricter in Java 8. Building with it fails with errors of following type:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-  plugin:2.9.1:jar (attach-javadocs) on project openwayback-cdx-server: MavenReportException: Error while creating archive:
[ERROR] Exit code: 1 - /Users/sidoroff/Programs/openwayback/wayback-cdx- server/src/main/java/org/archive/cdxserver/filter/CollapseFieldFilter.java:16: error: unknown tag: field
[ERROR] * <field> = if <field> matches previous match, then its a dupe <field>:<n> = if
[ERROR] ^

The errors are caused by having XML-like tags in the javadoc.

A bit of googling turned out the following link: http://blog.joda.org/2014/02/turning-off-doclint-in-jdk-8-javadoc.html

Adding line

<additionalparam>-Xdoclint:none</additionalparam>

to pom.xml <properties> section fixes the issue, but perhaps the comments should be fixed at some point. I'll make a pull request with the simple fix later, if anyone doesn't do it before.

[anjackson]

Resolved by #139.