Convert Microsoft Reader format eBooks into open format

Current version

convertlit requires the following formula to be installed:
libtommath 1.0.1 C library for number theoretic multiple-precision integers

Recent formula history

Andrew Janke audit fixes: C 04: cloog - cowsay
Nikolaus Wittenstein Add descriptions to all remaining homebrew packages
Jack Nagel convertlit: use make -C

Formula code at GitHub