use jenkins' build status images

this allows the log-parser-plugin to show the build status indicators consistent with the rest of jenkins.  Meaning: if green-balls-plugin or glowing-balls-plugin (for instance) is used to modify the build status indicators, log-parser-plugin will show the same status indicators.

also:
 - doesn't delete the static images in this plugin so that older builds still link to a valid image.
 - clean up numerous w3c validation errors
 - fix a couple comment typos
 - add description and upgrade version and groupId in pom.xml
 - add README.md