Revert "loggly: Add peek functions to DiscardRollingOutputStream (#21)"

This reverts commit 249690dd051258c8775131da010a05dca3430a03.
Revert "loggly: Append new-line to log entries if needed (#21)"

This reverts commit d51377c7f4dafbd88f89cdaab36edf887ab02796.
loggly: Append new-line to message as needed (#21)

Make sure messages end with new-line char to delimit individual
log events within the batch sent to loggly.

Fixes #21