[CRAW-29] prioritising plugin
[CRAW-29] javadoc for prioritising plugin, minor changes
[CRAW-29] adding info to src/plugin/prioritising-link/ivy.xml
[CRAW-29] adding prefix 'nutch.links.' to properties
Merge pull request #3 from integralads/fb/craw-29-prioritising-plugin

[CRAW-29] prioritising plugin