Add agedu

The checksome on the tarball isn't stable.
f2c 20130926 (new formula)

Added new formula for Netlib package f2c, Fortran-to-C converter.
Includes version and Hello, World tests.

Closes #44.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Exact Image HEAD formula

Closes #47.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Add choose

Closes #42.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>