display wrapped exception if we crash in batch mode

i would like to display source information, though, as the repl does.
add shebang executable example
provide *1, *2, *3 and *e in the repl
make the help a tiny bit prettier
add individual predicates for the num types
add convenience functions for transients
implement into
implement unsigned-bit-shift-right
merge branch 'master' into friendlyness
Merge pull request #46 from heyLu/friendlyness

Friendlyness fixes