Merge pull request #12 from nickburscough/master

Removed password from plaintext / removed some random, un-needed comments.
Merge pull request #13 from nickburscough/master

Lots of updates [see comment]
Fixed syntax on readme
main_couscous now redundant
renamed users.txt to crs_ids.txt, now called from python mail func
renamed couscous.py to food_search.py, hopefully resolved links
readme elucidation
detect mailing list duplicates. DOESN'T WORK FOR N > 1
Main class consolidated, removed all the perl but archived it for later use - i.e. when we refactor the login perl stuff to login and book hall