Fix how the name/pid of the process is printed in crash reports

Before this fix, the code assumed that processes without a registered
name omitted the {registered_name, X} tuple in the crash report. In
actual fact, process_info/2 returns [] when the process has no
registered name, so unregistered processes were being printed with a
"name" of "[]". This corrects the code to print the Pid in this case
instead.

Use mfargs instead of name attribute as the way to detect supervisor_bridge

Fix issue #20

Make the tests less dependant on timer:sleep()

Fix typo in README

Several fixes for printing binaries, improve quote stripping

In string mode, "..", '..' and <<"..">> are stripped, just like with
io:format.

As Ryan pointed out, the 'name' of a supervisor's child may be
'undefined' for a simple_one_for_one supervisor.

Fix term printing in errors to properly show embedded lists

The ~w formatting used before was not printing lists embedded in other
terms. This change uses trunc_io to print those terms safely and without
potentially introducing linebreaks (like ~p would)

Adt fix print bugs

The test if an element in a list was in the printable range didn't
handle the case of a float in the list that compared to be in the
printable range.

Use the io_lib_format:fwrite_g function to print floats

This is superior to float_to_list as it only prints the meaningful
digits and 1.0 isn't rendered as "1.00000000000000000000e+00".

Use lager_trunc_io:format() for all messages submitted via
lager:log().  Also, refactor list flattening and final newline
stripping into shared func that uses re:replace() to do both.

Fixed syntax error w.r.t. configuration example

If backends have a failure or something, don't discard the messages,
wait half a second and then try sending them again.

This solves an issue reported by 'cloudhead' in IRC where deep lists
weren't being flattened when printed with format specifiers like ~s ~p
and ~P, all of which should flatten the list.