Updated history with select dropdown.
Created history.js

Started JS file, adds list of other users into dropdown.

When the select changes it will fire off another ajax request to load
the conversation into a clickable list, clicking the items in the list
will load the conversation into the textarea.

To faciliate this we need some new scripts:
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conversations-with-user.c (?target=<valid user>)
  - Will take a parameter of user and use the session to find convos
  - Will return a list of conversation file names

history-for-date.c (?target=<valid user>&date=<YYYY-MM-DD>)
  - Will take a parameter of user and filename and attempt to load
  - Will return empty text if invalid user/filename
  - Will return conversation between user and logged in user for
    filepassed/date given. Will probably do it by date...