Implemented addition of numbers
Added tests for integer addition
Added multiplication
Added multiplication
Added 'lambda2', 'call2', ...
Using 'f()' and 't()' instead of 'f_' and 't_'
Binary subtraction
Trying to make 'add' and 'sub' more similar
Implemented 'zip' like in Ruby
Changed argument order of 'call2' and 'call3'
Added 'inject' like in Ruby
Merge branch 'master' into dsl
Added animated and static logo
Added axis to logo
Reduced size of GIF logo
Made building logo optional
Started using 'zip' and 'inject'
Added 'foldleft' required by 'select_if'.
Reduced TODO
Minor fizes