Improve type conversion performance by reducing key iteration
Added headers to record.
Added add_http_headers option.
Merge pull request #252 from RafaelSzefler/master

Added headers to record (in_http).
Add add_http_headers option test
Remove logging functionality from TextParsers
Merge pull request #254 from fluent/remove-global-log-from-parser

Remove logging functionality from TextParsers
require sigdump
Merge pull request #256 from sonots/sigdump

Add sigdump
Add rotate tests in in_tail plugin
Add a test of not setting 'pos_file' paramter to in_tail plugin.
Override Engine.emit_stream for tests before input plguin start
Add read_from_head config paramter to in_tail plugin.
Add a test of setting 'read_from_head' config paramter to in_tail plugin.