Replace ambiguous MIT license mentions with Expat
Replace ambiguous MIT license mentions with Expat

MIT has used many licenses for software. Calling this project to be
available under a "MIT" license is misleading.

pomf/pomf,alucard0134/Pomf,pomf/pomf,alucard0134/Pomf,ewhal/gpomf,pomf/pomf-php,alucard0134/Pomf