Added default values. Need to modify iterator logic to handle default values
Modification to Vertical Iterators

Vertical Iterators have been modified to fit inside TNodeI
and TEdgeI
Default Changes before iterator fix
Fixed Iterator Buggit status
Merge completing. Fixing bug
Finished Merge. Iterator Bug Fixed. Defaults now Work.
Added minor testing
Added All Attribute Type for Vertical Iterator

For both nodes and edges, add each attribute type.
Also, change function declaration so that
vector is pass by reference
Merge branch 'vert_iter' of github.com:snap-stanford/snapr into vert_iter

Conflicts:
	snap-core/graph.cpp
Get rid of ^M Line endings
Merge branch 'vert_iter' into defaults

Conflicts:
	snap-core/graph.cpp
Removed warnings
Added error checking via simple -1 return code.