Refactor password.c a bit, add different error checking

Fix formatting issues in password.c

Add tests and error checking for large salt requested values to prevent overflow on allocation

Implement php.ini setting password.bcrypt_cost

Refactor salt generation, rename password_create to password_hash

Implement openssl support for make_salt

More error checking, and some cleaning up for password.c

Basic random generator added to make_salt

Fix memory leak on branch

Implement password_verify

Actually complete password_create()

Base structure for passsword_create and password_make_salt