Add path_increment option to enable/disable path number increment to out_file
Improve gzipped file check in out_file test
Change path_increment parameter to append
Merge pull request #334 from fluent/support-append-out_file

Add path_increment option to enable/disable path number increment to out_file
support json/msgpack arrays
Add TextFormatter module. fixes #312
Change several option names and fix some bugs
Add TextFormatter tests
Use TextFormatter in out_file
Improvements for json/msgpack in_http support

- Use MultiEventStream for efficiency
- Remove needless test code
Avoid crashing in in_tail if a file doesn't exist when the process
starts and read_from_head is enabled.
Merge pull request #337 from fluent/add-text-formatter

Add TextFormatter module. fixes #312
Add a test to verify that a missing file doesn't cause in_tail to crash.
onekey format changed to single_value in TextFormatter
Delete the time field if found in JSON
Add log message to warn users if a file that is supposed to be tailed
with read_from_head enabled does not exist.
Merge pull request #339 from a-robinson/master

Avoid crashing in in_tail if a file doesn't exist when the process starts and read_from_head is enabled.
Merge pull request #338 from kiyoto/in_http_multi_event

support json/msgpack arrays in in_http
Use Etc module to fix incorrect 'id' command usage. fixes #340
Merge pull request #341 from fluent/fix-incorrect-id-usage

Use Etc module to fix incorrect 'id' command usage. fixes #340