Added doc for -C option for config directory
CONFIG_DIR to CONFD_PATH
Allow string escapes in delimiter

As far as I can tell, there is no way for me to represent a newline as
a delimiter in a configuration file with ConfigParser. I want to do this:

      [/ephemeral_storage/logs/kind_of_special.log]
      tags: special
      type: special
      delimiter: \n\n

As the log has a blank line between its multiline entries.

My change allows that, by making delimiter not string-escaped until
after the config file is parsed. I'm naive about python, so there is a
strong possibility I've gone about it horribly wrong. This would also
easily allow splitting on nulls, tabs, unicode characters and other
things that ConfigParser may not find kosher.

By doing this sort of multiline parsing with beaver, it allows one to
run logstash without the multiline filter, which due to its lack of
thread-safety, forces you to run logstash with only one worker thread.
Fixed example in Readme.rst for sqs_aws_secret_key
Allow path to be None

Allow path to be set empty (None) in the configuration filer. This way
all files and globs can be configured in files in confd_path.
Merge pull request #171 from romabysen/master

Allow path to be empty in configuration file.
Merge pull request #169 from jonathanq/master

Fixed example in Readme.rst for sqs_aws_secret_key
Merge pull request #153 from iyingchi/master

Added some missing confd docs
Merge pull request #165 from meekmichael/meekmichael/allow_string_escapes_in_delimiter

Allow string escapes in delimiter