Update .gitignore.
Add my answer to Exercise 1.14.

As the tree incredibly stretching out of the horizontal margin of
a particular A4 paper, I gave up exporting this solution into a
PDF or PS. So, the only file included is:

	Exercise_1.14.tm

Thank you!
						Lawrence R. Amlord
						   Apr 26, 2013
						   Xi'an, China