Documentation update for Jersey filters

Updated the documentation to reflect Jersey 2 and the current filter
example.
Documentation fix for Jersey filters

Some further improvements of the documentation.
Added example using Dropwizard

Simple integration test demonstrating use of DropwizardAppRule and correct syntax for Jersey 2.13.
Removed unnecessary comments.
Update DataSourceFactory.maxSize api docs

* maxSize is initialized to 100, not 10
Merge pull request #792 from LeekAnarchism/fix_maxSize_docs

Fix DataSourceFactory.maxSize Javadoc
Merge pull request #790 from Jerry-Carter/master

Simple DropwizardAppRule integration test for dropwizard-example
Merge pull request #788 from oddmar/jersey-filter-documentation-update

Update Jersey filter documentation
Sanitize URL pattern from rootPath