Add debug support for this Travis build

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Check working directory in debug script

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add build status badge from Travis

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Testing affordances of Travis

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Build using current version of Abjad

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add Abjad build script

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Updates to Travis CI build

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>