Rename local directories using a vector of patterns and replacements.

This function is meant to help with renaming local student repos to include something more useful like Last, First name or a unique identifier for the purposes of ordering repository folders.

local_repo_rename(repo_dir, pattern, replacement)

Arguments

repo_dir	Character. Vector of repo directories or a single directory containing one or more repos.
pattern	Character. One or more regexp patterns to match to directory names.
replacement	Character. One or more text strings containing the replacement value for matched patterns.