Added name attribute

fixes incompatability with ridley 3.1.0

">>>>>> Message: Failed to complete #converge action: [The metadata at
'~/.berkshelf/cookbooks/logstash_handler-0.0.2' does
not contain a 'name' attribute. While Chef does not strictly enforce
this requirement, Ridley cannot continue without a valid metadata 'name'
entry.]"
Merge pull request #3 from Igorshp/master

Added name attribute