Extended the SimpleCrawlTool :
 - added an option to use Boilerpipe when parsing. 
 - output of Boilerpipe content is written out as a WritableSequenceFile.  
 - added regex support for url filters. 
 - added an option to clean out an existing loop directories.
Move BoilerpipeContentExtractor to bixo-core.
Fix copy/paste error in setting up Logger for RegexUrlFilter.
Instead of using the ParsedDatum's url and parsed text field names, define new fields for the WritableSequenceFile.
Fixed a bug in the readFilters method.
Added examples of regex filters to the default regex-url-filters.txt file.
Renamed SimpleCrawlTool and SimpleStatusTool to DemoCrawlTool and DemoStatusTool to make it absolutely clear that these tools are just examples.
Rename the WebMiningTool to DemoWebMiningTool.
Changed parameter name from -regexfilters to -urlfilters. Added boilerplate copyright notice to RegexUrlFilterTest.
Update the bin/bixo script to reflect the new Demo* names.
Added a -logsdir option to enable outputting the loop specific logs to a customizable (local fs) location.
Clean up some unused code.
Added examples/logs to gitignore
We want to output the parsed text (in the WritableSeqFile) irrespective of whether we specify the use of Boilerpipe.
Allow a caller to specify a different extractor than DefaultExtractor when setting up BoilerpipeContentExtractor.
Added conjars to the list of repos.
Updated Releasing doc - we are now going to be pushing bixo-core to Conjars.
Added checks for the expected page scores in the web mining workflow unit test.
Renamed WebMiningWorkflowTest -> DemoWebMiningWorkflowTest
Updated the README file.
Updated pom for helpful to use released version of Bixo