added viz library namespace instaparse.viz
 On branch master
removed test grammar and call of tree-viz
knocked out loading instaparse.core, not actually needed
algorithm simplified courtesy @Engelberg
removed inherent rhizome dependency, added try/catch
 On branch master
try/catch without namespace and project dependency fails to load rhizome.viz
 On branch master
 On branch master
Merge branch 'master' into v1.2

Conflicts:
	src/instaparse/viz.clj
 On branch v1.2
Merge branch 'v1.2' of https://github.com/mnemnion/instaparse into v1.2

Conflicts:
	src/instaparse/viz.clj
added enlive visualizer and supporting functions. NB: the namespace trick
does not succeed in loading rhizome on my system, where it is in fact installed.

 On branch v1.2