Don't touch the file

This was silly to start.  Its lame, but we have to wait to make sure
that node will acknowledge a time difference between the two files.
However, why update, then wait then touch?  We can just wait, then
update.
Clean directory with fs

Recursively run through the directory using commands from fs instead of
running commands directly with exec.
Merge pull request #19 from Andrew-Hagedorn-ZocDoc/CleanDirectoryInTestsUsingNodeToAvoidCrossPlatformIssues

Clean directory in tests using node to avoid cross platform issues