Remove outdated documentation.
Fix Javadoc issues reported by JDK8's doclint.
Disable doclint for all groups but accessibility and reference.

With JDK 8, doclint has been added to Javac and Javadoc. It is enabled
by default but it is too strict for JUnit. The only groups that don't
report issues are accessibility, reference and syntax. But syntax has
to be disabled for Javadoc because the Hamcrest classes are reporting
syntax issues.

Additionally doclint is disabled for JDK < 8, because the -Xdoclint
argument causes a failing build in JDKs before JDK 8.
Verify javadoc on Travis CI.

The build should fail for Javadoc issues.
Use compilerArgs instead of compilerArguments.

The parameter compilerArguments is deprecated.
Small refactoring of pom.xml
Merge pull request #907 from Tibor17/junit.fix

Small refactoring of pom.xml
update maven-replacer-plugin version
Merge pull request #910 from mynxyl/replacer

update maven-replacer-plugin version
Small fix,correct spelling mistake
Merge pull request #912 from mynxyl/fix

Small fix,correct spelling mistake
Merge pull request #883 from stefanbirkner/doclint

Doclint