fix the 'match may not be exhaustive' compiling warning
Bumped up version no.; added lag, offset, & log size; some refactoring
Partially implemented offset history graph; cleaned up code; fixed minor bugs
Merge pull request #14 from pengyanhong/master

fix the 'match may not be exhaustive' compiling warning
Made fix to show owner ids
Added lag to graph; made configurable purge schedule and offset fetch request interval;
Fixes #3
Fixed issue where ZK is not delete properly
Refactoring
Fixes #1
Refactoring; updates deps; minor changes to UI
Polished UI
Polished UI
Attempt to fix merge conflicts. Builds and runs but is broken.