Create repeat_string_csv_lookup.ps1

<# 20141205 dc v1.0 - Checks across multiple files in a specified path for any duplicate strings

Primary usage is for looking up repeat strings based on emails using CSVs.
Import-CSV not used because it combined with a select statement adds too many blank lines and non-print chars
Objects are still created since they're single lines and we're not utilizing tokens.

Syntax: repeat_string_csv_lookup.ps1 -d PathToCSVFiles -o OutFile.txt

NOTE: You may receive the following errors: "You cannot call a method on a null-valued expression."
This usually occurs depending how windows concats the files with and did not strip out any spaces/null chars