Adding the basics of a working TfL Status IA

Added all the files needed to get it working, filled in the basic
attribution metadata etc. The line status API call uses my 3 scale
tokens registered under tim@darkshines.co.uk. Also added a very basic
set of rules to the Perl module to take care of edge cases with lineIds
on:

- Hammersmith & City > hammersmith-city
- Waterloo & City > waterloo-city
- Overground > overground

There's something funny with the API call for DLR which is annoying,
will need to look at that later.
http://api.tfl.gov.uk/line/dlr/status?app_id=4b57df3f&app_key=a3b1543277303ffaff1c3122044a6653
Fix for the DLR Line Status

For some reason the TfL API needs the API call to be cased correctly
i.e. /Line/{lineId}/Status, but this only manifests itself when using
the 'dlr' lineId. Strange. We now send the Pascal-cased version for all
lineIds to get round this problem.
Include the reason for the status below the title

Includes the reason for the first status below the h5
containing the statusSeverityDescription. This is only returned from the
API when the status is not "Good Service"
Fix for the "More at..." link to correct lineId

The sourceUrl link which controls the "More at tfl.gov.uk" href is now
fixed to link to the correct anchor for the line in question. This will
open the further information accordion and zoom the SVG map to the
correct line. (There appears to be an issue with the lineIds being incorrect on the
map  on tfl.gov.uk at the moment?)
Add unit tests
Regex style improvement after code review
Fix trailing comma after code review
Add period to the end of the status title
Added new trigger for "line tfl"

Example query "victoria line tfl" now triggers a lookup of the victoria
line status. Updated tests for the new trigger.
Early exit from trigger if value is null or empty

In accordance with code review on
https://github.com/duckduckgo/zeroclickinfo-spice/pull/984
Change TfL API call to use HTTPS
Disable caching of TfL API responses

We want realtime status information, so we must disable the default
caching of API responses.
Add some more triggers based on top autocomplete

Based on suggestions in the duckduckgo.com autocomplete, I've added:

- xxxx line london
- xxxx line london underground
- xxxx line london tube
- xxxx line underground
- xxxx line tube
Merge pull request #984 from idlem1nd/feature/tfl-status-clean

Transport for London line status