Fixed the id auto increment bug, when there is just one record that id = -1, the expected value is 1, but actual return -1.

Changed boolean type to integer, true: 1, false: 0.

Concurrency conflicts in Spring plugin #735

Feature/storage h2

Application reference metric,  Application metric, Instance reference metric, Instance metric, Service reference metric, Service metric pyramid aggregate by h2 storage test successful.

Merge pull request #737 from michaelsembwever/mck/manually-download-apache-incompatible-dependencies

Remove OJDBC and resin artifacts from ci-dependencies driectory as they as not Apache license compatible

Remove OJDBC and resin artifacts from ci-dependencies driectory as they as not Apache license compatible.
The user can onetime manually download them, and the maven reactor will automatically build the corresponding plugins.

OJDBC is OTN which requires a user click-through agreement.
Resin is GPLv3, meaning any derivative work must also be GPLv3 licensed.
https://www.apache.org/licenses/GPL-compatibility.html

ref: https://github.com/apache/incubator-skywalking/pull/737

Protect the background processes.

[Agent] Support jdbc4, jdbc3 and jdbc42 of postgresql driver

* EnhanceRequireObjectCache add clearRequestAndResponse method
* invoke EnhanceRequireObjectCache clearRequestAndResponse At AbstractMethodInterceptor

[Agent] Support the version 9.4.x of postgresql jdbc driver

Update README.md