[cli-diff] checkpoint: added command
[cli-diff] added dispatch
[cli-diff] simple spreadsheet functor
[cli-diff] logic to expand @file into file list
[cli-diff] netid of filepath
[cli-diff] count rows
[cli-diff] all_files_exist, will need revision for core
[cli-diff] check/assert installed, will need merge with email command
[cli-diff] the new diff
[cli-diff] sheet updates existing rows, writes to Spec fname
[cli-diff] synced with master
[cli-diff] inlined the diff-and fn
[cli-diff] tidied some whitespace
[cli-diff] synced filepath utils
Merge pull request #72 from cs3110/cli-diff

Port diff command to core