Merge pull request #26 from ibalashov/master

SecorConfig ThreadLocal
[secor][progress-monitor] Add option to print metrics as JSON to stdout
[progress-monitor] Address feedback
Merge pull request #29 from ibalashov/master

Offsets storage path fixed in zk
[progress-monitor] Address feedback
[progress-monitor] Address feedback
Merge pull request #25 from andykram/monitor-json

[secor][progress-monitor] Add option to print metrics as JSON to stdout
Modified consumer to adjust seen offset for all messages, regardless of whether a message is parseable.
Merge pull request #31 from affectv/master

Modified consumer to adjust seen offset for all messages.
Update contributors.
Merge pull request #32 from affectv/master

Update contributors.
gzip reader and writer
add performance test
switch to hadoop Gzip (faster) and fix merge bug
incorporate all changes suggested by pawel
add param to specify reader/writer
add Compression util method
NPE fix
remove unused imports
mock gzip file input/output stream for tests