Implemented entry creation, pagination. Some restyling and bugfixes.

- Bug fix in ts_api:list_entries/3. Case statement matching on atoms but
  input is a list (string).
- Bug fix in ts_api:put_entry/3. Was expecting the wrong result from
  ts_entry:new/1.
- Bug fix in ts_entry:list/4. Code crashed when the starting offset was
  greater than the total number of elements. Now returns [].
- Fixed ts_json:encode_datetime/1 and ts_json:decode_datetime/1 to handle
  millisecond values in the datetime string (per ISO standard).
- Broke out ``control-links`` style to a top-level class.
- Added showdown.js, a JS Markdown processor. Not hooked up to anything
  yet but intend to display entry notes with Markdown.
- Added code for entry pagination. Loads the most recent 20 entries and
  loads more upon demand in batches of 20.
- Fixed bug in login routine that kept the user edit fields from being
  pre-populated.
- Rewrote the loadEntries function to double for new entries and loading
  more existing entries.
- Commented displayEntries. Also refactored into displayNewerEntries,
  which pushed new entries on to the top of the stack, and
  displayOlderEntries, which tags them onto the bottom.
- Implemented hidden notes field for new entry input.
- Implemented new entry creation.
- Created a helper function to ISO format a Date object.
- Expanded entry template to show control links (edit, show notes, del).
- Activated the 'load more entries' button.

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