another fix to #164, eliminating last date appearing twice
Memoizing the returned time dimension for a ncWMS layer

The code was looping before hitting the guard/memo code this returns early if the time
dimension has been memoized.
Merge pull request #193 from aodn/issue-164-double-ts

Issue 164 double ts
fixed ISO8601 date/time expansion and also fixed formatting (now using 24 hours format)
Merge pull request #196 from aodn/timestamp-fail-test

fixed ISO8601 date/time expansion and also fixed formatting (now using 2...
#176 Removed a line from general.css which was causing DateFields to miss display when clicking the month/year drop down.  Phil added the line a year ago for a bug relating to resetting map, but it doesn't seem to be replicated now, so I feel confident removing.  Also removed some commented out stuff from 2011 which we clearly don't need.