Fix bug with ASF's per-traverse object: t+

Bug reported in marpa-parser group email from Ruslan Shvedov
  Date: Thu, 16 Jan 2014 17:06:41 +0200
  Message-ID: <CALTky2dEjkxTYmrx=EKxLrGaV39HtoK2i=4YvXrLr5i4T9_F=g@mail.gmail.com>
Merge remote-tracking branch 'upstream/master'
added push_lhs command returning undef for the time
remove space after comma that follows lhs
add output file for basic_test target
push_lhs command now returns the right lhs id's
Work on push_lhs command: t+
remove debug printing
return undef for nulling symbols and check negative symbol ID's per Jeffrey Kegler comments
added push_lhs command returning undef for the time
remove space after comma that follows lhs
add output file for basic_test target
push_lhs command now returns the right lhs id's
Work on push_lhs command: t+
remove debug printing
return undef for nulling symbols and check negative symbol ID's per Jeffrey Kegler comments
Merge pull request #86 from rns/lhs_desc

lhs array descriptor
remove debugging code
Merge pull request #87 from rns/touch_up_sl_timeflies.t

remove debugging code
Add basic_test.out to Makefile: t+

Followup to github issue #86