Documentation updated in scripts and help messages
Merge branch 'master' of https://github.com/blernermhc/RDataTracker
Update documentation in scripts and help files.

Conflicts:
	DESCRIPTION
	R/RDataTracker.R
Passing 0 for max.snapshot.size to ddg.init or ddg.run now results in no
snapshots at all.  Instead data nodes with no value are created.
Merge branch 'master' of https://github.com/blernermhc/RDataTracker.git

Conflicts:
	DESCRIPTION
	R/RDataTracker.R
Moved the code in ddg.return that creates the function nodes if they
don't exist to before it creates the return node so they can link
together properly.
Added recursion tests, which currently fail, to ReturnTest.R.

Clean up of library.
Updated Using DDG Explorer document to be consistent with Version
1.013.
Updated images.
Removed Java Directory from repository commits. Modifying documentation to include list of figures
Added Known Issues section to DDG Explorer documentation.
Removed .ddg.grabhistory function.
Quote strings in return node names

Fixed creation of return node names even when call to the function is
long.

Fixed creation of bindings when string constants and arbitrary
expressions are passed in as arguments.
Renamed ddg.return to ddg.return.value and updated the tests.

Added a README on how to build and test the library.
Updated version number
Made NULL as the default parameter value for ddg.return.value.

Changed ddg path variable to hold the full path to the ddg directory.
Added mustWork = FALSE to normalizePath call for ddg directories.

Updated expected test results.
Updated version number.
Fixed merge conflict

Merged files and updated the guide for DDG Explorer to include
figures/list of figures.
Merge branch 'master' of github.com:blernermhc/RDataTracker

Conflicts:
	vignettes/UsingDDGExplorer.Rnw
Updated documentation for RDataTracker