Removed testing comments from node_mgmt.h
Ported scanParent to scanChild. Added TODO comment

TODO -> handle memory collision in a more robust way.  May need to add
info into the handle / reserved memory to better handle the collision.
ported more parent node functions

Create, Read, and Invalidate.
Started port of delete.
Added prototype for port of update.
Added defines about child structure size.

Builds
First full commit of child node port

Data child nodes are currently not supported.  Basic Credential sets
only.

TODO:
1) Add robust checking of parent / child node relations/
2) Relocate initial scanning of parent / child nodes only occur when
needed
3) Allow current child node implementation to be used as child start of
data
4) Implement data nodes (tied w/ 3)
Merge pull request #51 from mikeneiderhauser/master

Node Management - Child Node Support