new graphite.Cliente()

• can now use new graphite.Client(options) as an alternative to graphite.createClient(options)

Add option maxPacketSize

• split metrics into smaller udp packets to avoid reaching udp max packet size limit. Thanks to gossel-j
• add option to change maxPacketSize
• stop using util._extend(). Use own extend() function
• use eslint instead of jshint

API refactory

1.0.0

making callback and port explanation shorter