Makefile: Compatibility fix for GNU make 3.82

With GNU make 3.81, this Makefile was working fine. With 3.82, I was
getting this error:

    sed: 1: "/<start python docs>/,/ ...": invalid command code \

The backslash at the end of the line was being seen literally by sed
(because it was inside single quotes). Presumably the older version of
make was stripping the backslash out completely. The new version of make
behaves as per the specification:
http://www.gnu.org/software/make/manual/html_node/Splitting-Lines.html

The solution here is to use double quotes instead of single quotes.
Consider these examples of shell behaviour:

    $ echo 'a\
    > b'
    a\
    b

    $ echo "a\
    > b"
    ab
index.html: Bump copyright notice to 2013
index.html: Reorder documentation links so that hardware comes last

This is to introduce some kind of ordering for the upcoming articles on
software-related issues (image processing parameters) and on hardware
configuration (using multiple lirc transceivers).
Initial commit of template matching article

Needs some work on CSS layout.
Suggested changes from Dave and Mate

* Refer only to Python API parameters
* explain the heat map
* explain stbt-debug

Also: summary of second pass added to end of section
Various markup changes (italics, bold, etc)
Removed unused image and name in Makefile
Template match article: Minor wording & spelling fixes
Rename templatematch-process.rst => match-parameters.rst
Change article title to "stb-tester image matching parameters"
Remove unused images

Sorry about mixing a formatting change (reformatting the list of images
in the Makefile) with a functional change (removing some of those images
from the list); the only way I could sanely figure out which images were
present in the Makefile *and* on disk *and* in match-parameters.rst was
by making ordered lists with one item per line.
Prefix filenames of images from match-parameters article

...with "match-parameters-", so that they group together in the output
of `ls`, etc.

Putting them in a subdirectory would require changes to the `make
deploy` recipe that I don't have time for right now.
Match parameters: Fix the copyright year
Link the "Image-matching parameters" article from the front page
Merge branch 'match-parameters'

New article "Image-matching parameters" by Lewis Haley
documenting the effect of the various parameters you can pass
to `stbt.wait_for_match`, `stbt.detect_match`, etc.

* match-parameters:
  Link the "Image-matching parameters" article from the front page
  Match parameters: Fix the copyright year
  Prefix filenames of images from match-parameters article
  Remove unused images
  Change article title to "stb-tester image matching parameters"
  Rename templatematch-process.rst => match-parameters.rst
  Template match article: Minor wording & spelling fixes
  Removed unused image and name in Makefile
  Various markup changes (italics, bold, etc)
  Suggested changes from Dave and Mate
  Initial commit of template matching article