This reverts commit fad89734, reversing
changes made to e284b0dd.

Revert "Merge pull request #4254 from astaxie/develop-2.0"

This reverts commit e284b0dd, reversing
changes made to 8ef8fd26.

Prepare Release v2.0.0-beta

fix init error of global instance

Add test for httplib

Add global instance for config module

support using json string to init session

Change NewHttpServer API

add MaxUploadFile to provide more safety uploading controll

fix 4224：form entity too large casue run out of memory

Fix ini Unmarshall method

Using unmarshaler to parse config in web module

Upgrade toml version

remove config API's context parameter

Support toml config

Remove scripts directory & update readme

Reorganize packages

remove build directory;
remove githook directory;

Reset func call depth & add adapter.sh

logs Adapter