add Hadoop/HBase input choice for ExtractLinks and ExtractSiteLinks classes
fix the bug of selecting webpage by date ineffective
add UriMappingBuilder Mapreduce version
Removed extra command-line argument.
Configuration for Wayback/Warcbase integration.
Updated documentation.
Updated documentation, issue #61
reformat code
resolve conflicts
Light refactoring
Uri -> Url classes renaming.
Bumped up memory, fixed class renaming.
Lightweight refactoring.
Refactoring on local UrlMappingBuilder.
More refactoring.
Added command-line options.
Updated documentation.
Fixed:

Issue #52: MapReduce implementation of UrlMappingBuilder
Issue #68: Refactoring and cleanup for UrlMappingBuilder
Issue #69: Update URL mapping builder documentation
Merge branch 'master' into cneud-integration