Merge pull request #22 from mdevaev/send-all-fields

Send all fields if fields-option is none
fixed non-blocking mode
Don't log internal elog messoges (writing to stderr)
Merge pull request #23 from mdevaev/master

Fixed non-blocking mode
Bump version: 0.8 → 0.9
fixed threading in multiprocess applications
refactored tests
removed needless comments
Bump version: 0.9 → 1.0