Submodule Boost 97fb1af..79dab68:

> Skip the svn update now we're on git.
  > Ignore the build directory.
  > Ignore the build files.
Added Ubuntu/clang note.
Use libraries from github not subversion.
Fix the example to use the new film API.
Merge branch 'feature/github' into develop
We need to actually use the function that initialises the film colours.
There's no need to pass the film into the lambda again.
Deleted some unused code.
Make sure that we can access the colour values.
Implement saving true colour Targa images.
Expect to be called with x, y and not an extents corner.
Do a 24bit gray scale image instead.
Deleted tests that weren't testing any used code.
Removed some code that is just extra complications without adding value.
Fix the channel order for true colour images.
Moved the typedef to near where it is used.
Pass the colour construction into the mandelbrot.
Simplify the maths that does the position calculations.
The parameter is the diameter not the radius.
0, 0 is the top left.