liberated the builtin if function to check numbers

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
some new functions, standard library

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
docoumented more standard lib functions

Signed-off-by: Alexander Skjolden <alex@plastboks.net>
Merge branch 'master' of github.com:plastboks/byol