增加EnvironmentPostProcessor处理，将Apollo配置加载提到初始化日志系统之前

fix the executing sequence of initializeSystemProperty

remove nicescroll

增加 Spring Boot 配置的方式eureka.service.url配置字段，方便利用kubernetes的ConfigMap方式

add active directory support

Fix #1609

version to 1.2.0-SNAPSHOT

shutting down the demo server, temporarily.

Block delete default cluster

Support to override meta server url through environment variables.

commit 49a8bd839e1f13c0c3b91f8d314dd4cb3fca1e3e
Merge: 211848897 e34cdce4f
Author: JaredTan95 <jian.tan@daocloud.io>
Date:   Sun Oct 14 12:33:46 2018 +0800

    Merge branch 'master' of https://github.com/JaredTan95/apollo

commit 2118488976059333c8e4c006d98cb37d81097a11
Author: nobodyiam <nobodyiam@gmail.com>
Date:   Sat Oct 13 16:49:39 2018 +0800

    version to 1.1.1

    clean code.

    fix code style.

commit 9e32fcc48b8c7dfbc3c3869ccc81091a0890a02a
Author: JaredTan95 <jian.tan@daocloud.io>
Date:   Sat Oct 13 14:51:20 2018 +0800

    Support to override meta server url through environment variables.

commit e34cdce4f33528690deec7c3660dba514c3aeaef
Author: JaredTan95 <jian.tan@daocloud.io>
Date:   Sun Oct 14 09:35:35 2018 +0800

    fix code style.

commit 58e6fc7eef58f9623eb542c255ded0da59bb0852
Author: JaredTan95 <jian.tan@daocloud.io>
Date:   Sat Oct 13 20:15:38 2018 +0800

    clean code.

commit a7fcbecdec389215ea9ad73db627e1cb2d425f41
Merge: 15532fdf9 c22ac563
Author: Jared.Tan <jian.tan@daocloud.io>
Date:   Sat Oct 13 17:25:14 2018 +0800

    Merge branch 'master' into master

commit 15532fdf9ecb703f21f4f743a4651b6ae003f24c
Author: JaredTan95 <jian.tan@daocloud.io>
Date:   Sat Oct 13 17:23:27 2018 +0800

    refactoring legacy mete server and fix mistake in Dockerfile.

commit 3c9b00e24df47ee42a74771aa94fd2c383084b30
Author: JaredTan95 <jian.tan@daocloud.io>
Date:   Sat Oct 13 16:37:04 2018 +0800

    modify Dockerfile Env `Version` to prevent duplicate changes and errors

commit 9ec44a8954460ae72aa27300ea519e2d0c99f470
Author: JaredTan95 <jian.tan@daocloud.io>
Date:   Sat Oct 13 14:51:20 2018 +0800

    Support to override meta server url through environment variables.

version to 1.1.1

rollback spring boot maven plugin version to 1.3.5.RELEASE