[add] TSDB tailing capability + better locking (hopefully)

git-svn-id: https://spf4j.googlecode.com/svn/trunk@528 d408096a-aa36-d13b-a661-48d75a76e993
[add] improvements on tailer.

git-svn-id: https://spf4j.googlecode.com/svn/trunk@529 d408096a-aa36-d13b-a661-48d75a76e993
[add] improvements on tailer.

git-svn-id: https://spf4j.googlecode.com/svn/trunk@530 d408096a-aa36-d13b-a661-48d75a76e993
[perf] optimize polling.

git-svn-id: https://spf4j.googlecode.com/svn/trunk@531 d408096a-aa36-d13b-a661-48d75a76e993
Merge branch 'master' of https://github.com/zolyfarkas/spf4j