Added WARC support to UrlMappingMapReduceBuilder. It can now accept a
path containing a mix of ARC and WARC files.
Added WARC support to analysis:

WARC counterparts created for Count*.java
WARC support added to ExtractUniqueUrls (can handle mix of WARC and ARC files)
FindUrls -> FindArcUrls and FindWarcUrls

To use MultipleInputs (i.e. to handle WARC and ARC in single class) would have
required restructuring of Count* code. FindUrls does not implement MultipleInputs
either, because this makes obtaining input filename impossible without hacky code
(see JIRA ticket MAPREDUCE-1743 and
http://stackoverflow.com/questions/11130145/hadoop-multipleinputs-fails-with-classcastexception).
Merge branch 'master' into warc-support
Added getBodyContent(WARCRecord r)  method to WarcRecordUtils
Added WARC support to analysis/graph classes (except ExtractLinksJwat --
since project is moving to Wac APIs).
Error in README