Fixed bug #29 where ddg.save would print out NULL
Changed .ddg.is.simple to return false for lists

Fixed a bug in .ddg.loadhistory that caused it to fail if the last
line in the file was the timestamp.

Fixed a bug when processing outs.data parameter of ddg.procedure so 
that a variable name can be passed in as a name, not just a string.
Same thing for ddg.data.
Merge branch 'master' of https://github.com/blernermhc/RDataTracker

Conflicts:
	DESCRIPTION
	R/RDataTracker.R
Preliminary implementation of dynamic on/off console nodes
Documentation updates for preliminary ddg.console.{on/off} functions
If the history file is created, it will be deleted. Added a .ddg.is.set function to check for local ddg variables. Console node code seems to be working as expected
Fixed bug in ddg.is.functiondecl that was preventing it from
recognizing function declarations.

Added a function to convert lists to strings so that lists of S4
objects can be saved to text files.
Updating example files as well as adding new tests created by Barbara
Merged changes
Merge branch 'master' of https://github.com/blernermhc/RDataTracker

Conflicts:
	DESCRIPTION
Merge branch 'master' into Test-Branch