imap-append command. fixed a bug of method block scope for local variables.
Merge branch 'cmd'
imap-append command. error handling in message file list.
request reader. literal parsing bug is fixed.
fixed regexp patterns: ^, $ -> \A, \z
mail cache entries that no longer used should be released in scanning mails.
errors in scanning mails should be logged and skipped.
streaming response at fetch command.
protocol decoder. response data I/F is changed for streaming response data.
response data format is changed to enumeration of any data fragment
(with CRLF) and last response line (with CRLF) from line array (without CRLF).
protocol decoder. streaming response at expunge command.
protocol decoder. streaming response at search command.
protocol decoder. streaming response at store command.
request reader. refactored unit test.
request reader. fixed a bug of string (literal and quoted) parsing.
string of "body[]<>" should be parsed as a string, not a body symbol.
request reader. test case of bug fix check is added.