Add scalar value formatter
Add AWS DynamoDB handler

This also adds the `aws/aws-sdk-php` dev dependency
Refactor scalar formatter

Removed some of its own logic in favor of extending NormalizerFormatter to
benefit from shared logic.
ElasticSearchHandler and ElasticaFormatter
plug #245 log rotate with setTimedFilename
remove unused glob member
move public method before protected ones
switch from setTimedFilename to setFilenameFormatParams
change name according to Seldaek recommendation
address second comment on using str_replace instead of printf for setting filename format expression
Merge pull request #267 from cordoval/feature/logrotate_flexible

plug #245 log rotate with setTimedFilename
Add millisecond precision in the LogstashFormatter
Merge pull request #269 from acasademont/logstash_milliseconds

Add millisecond precision in the LogstashFormatter
Merge pull request #251 from skymeyer/elastic_search2

ElasticSearchHandler and ElasticaFormatter
Merge remote-tracking branch 'adlawson/dynamodb-handler'

Conflicts:
	README.mdown
	composer.json
Add version check for the AWS SDK, refs #260