Set learner_id in search.cc
Fix a bug in search_multiclass
Add test example for search multi-class
test result for search multiclass
Merge remote-tracking branch 'upstream/master' into multiple_learners

Conflicts:
	test/RunTests
	vowpalwabbit/search.cc
Merge
Merge pull request #435 from KaiWeiChang/multiple_learners

Search:search_multiclass & learner_id