Adds support for actual streaming events.
Clean up streaming test.
Adds space padding to event stream test.
Clean up streaming tests.
add period flush test
extract streaming test client
cleaner streaming test client
remove debug prints
minor cleanup
Merge branch 'events_streaming' of https://github.com/snormore/sky into snormore-events_streaming

Conflicts:
	server/server_event_handlers.go
ExecutionEngine fix from snormore.
Use deferred txn.Commit() on read-only txns.
Increase Factorizer MaxSize
Cursor fix.
Cursor fix (cont'd).
Add MDB_BAD_VALSIZE test case.
Fix stream event too large error reporting.
Truncate long factors.
Factor LRU cache.
Merge pull request #164 from skydb/factor-lru-cache

Factorizer LRU Cache