Uses 128-bit integers to compare fractions

See http://stackoverflow.com/questions/13325821 for alternative
solutions.
Adds new concat implementations
Adds syntax for methods calls

dict!method <=> call get-from dict :method
dict!method!argument <=> get-from dict :method :argument
dict! <=> call get-from dict
!method <=> call get-from eva :method
Adds --persist command line argument
Adds first functionality for --persist
Finishes implementation of --persist
Adds new join function
Adds new split implementation
Adds new slice implementation
Adds new split-any