fluent/logger

[features]

• add max retry option #24
  Author: Semen Kataev

[fixes]

• fix fclose warnings
• fix coding styles
• close connection after having exception on socket
• add retry_socket options

[misc]

• update vagrant box and use librarian-chef to manage cookbook.
• add stress test script into examples/stress. this usefull for testing
• fix testcases

[deprecated]

• throw away package.xml. we recommend to use composer

bumped up v0.3.5. fix awful typo.

Basically, stream_socket_connect can't get any errors with that API.
for now, we rely error_get_last()'s message. fluent-logger will close the socket and
reconnect to the host if it contains errno=32 (EPIPE).

[Changes]

• add exponential backoff strategy for reconnecting issue and it becomes defualt back off strategy.
  also change default attempt count.
• change method name: FluentLogger::clearInstances as fix typo.
• fix many many typos. i can't believe why i missed those things.

Fluent\Logger\HttpLogger::post and post2 should return boolean value.