add 'unmatch_silent' to configuration. logic, configuration test and README.
'unmatch_silent' is optional configuration that suppress 'pattern not match' log.
default value is 'false' (it means show 'pattern not match' log)
changed configuration name to suppress_parse_error_log.
added unit test code.
v0.2.2
ConfigError should be prefixed with Fluent:: in fixed_parser.rb
v0.2.3: fix dependency
add inject_key_prefix option
v0.2.4
add license to gemspec
add travis-ci configuration
add "hash_value_field" option to save parsed values as hash in single field
v0.3.0
add option not to parse time and to reserve that field, without parsing
v0.3.1