API to explicitly call log rotation

Reviewed-by: macintux

Do not add logroot in expand_path sometimes

Reviewed-by: bsparrow435

Option to not reformat error_logger messages

Reviewed-by: macintux

If expand_path/1 already contains LogRoot in its RelPath, do not
add it again.

Close file right after rotation

Reviewed-by: bsparrow435

Start traces after extra sinks are started

Reviewed-by: macintux

Bump goldrush to 0.1.8 for not equal filters

Reviewed-by: macintux

Fix internal tuple argument order

Reviewed-by: macintux

Before, the old file was still being used until the next
`check_interval`, where the file was recreated and reopened.

Support for separate sink for error_logger messages

Previously, if you configured a trace to use an
extra sink, you'd get a noproc error. Addresses
issue #296 on github.

Forward port #292 to 3.x branch

Reviewed-by: shino

255 is a valid ISO-8859-1 character. This was fixed
on 2.x by #292. Forward port the fix into 3.x.

Function for printing stacktrace in human readable form

* Add formatting options to align text differently if desired
* Fix some typos in comments and docs
* Optionally print all metadata
* Fix R15 compatibility

Add option to format output with Width param in lager_default_formatter

ex:[{pid, ["123456:", pid], ["Unknown Pid"], {right, 10}}] -> if pid is in the metadata print "   123456:   <?.?.?>", otherwise print "nknown Pid"
placeholders: date, time, message, sev, metadata and new placeholder blank(blank | {blank, Fill} ignore width param

Fix several typos in srcs

Add option to print all metadata in the default formatter

Metadata can be printed with standard or custom internal seperators ad field
seperators. The defaults are "=" and " ":

  "key1=value1 key2=value2"