fixed --autolink

Fixed a bug in autolink.cc: there was "<" instead of "<<". That could never work (with d>1).
Added a test for --autolink.
Merge remote-tracking branch 'upstream/master'
Adding --examples 100 to the test, so 0002.autolink.predict is smaller.
Merge pull request #444 from martinpopel/master

Fixed a bug in autolink.cc
added feature limiting
Merge branch 'master' of github.com:JohnLangford/vowpal_wabbit
update to master
Merge branch 'changing_label' of github.com:JohnLangford/vowpal_wabbit into changing_label