Make exception specs match the ones defined in callback
Improve docs for string, process and supervisor
Deprecations should go to standard_error
Do faster expansion on rewrites
Add a test for mix config files
Add iodata_to_binary and chardata_to_string to IO
Add String.to_char_list and List.to_string
Merge pull request #2288 from ericmj/compile-deprecations

Make deprecations compiler warnings
Optimize cond expansion
Move List and String deprecations to new mechanism
More deprecations around tuples and records
Move Integer/Float conversions to their respective modules
Get rid of BitString module and bitstring conversions
Move binary and list conversions to String and List
Update CHANGELOG
Reduce examples of disabling macros hygiene