Implement reia:eval/1, reia:apply/3, and reia:apply/4
Implement reia:eval/1, reia:apply/3, and reia:apply/4

reia:eval/1 accepts a string with a default empty binding. It's a simple string eval.

reia:apply/3 provides standard Erlang-style Module-Function-Argument (MFA) style function application.

reia:apply/4 provides MFA function application, but also takes a block.

tarcieri/reia,beni55/reia,beni55/reia,tarcieri/reia