Rewerite and revert some code that this library can be built in pre-C++11 and C++11 env.
Main Change List:
1. using -> typedef
2. not using auto & decltype
3. not using raw string literals
4. ..., other c++11 features will be chosen to compile, depending on env.
* update example directory
* modify some compile error.
* update with clang-format
* update
* update
* add_definitions("../include/json")
# Please enter the commit message for your changes. Lines starting
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# Date: Wed Jul 10 21:26:16 2019 +0800
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# On branch code_example
# Your branch is up-to-date with 'origin/code_example'.
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# Changes to be committed:
# modified: example/CMakeLists.txt
#
* change CMakeLists.txt
* update streamWrite.cpp
* update
* Update readFromStream.cpp
* fix typo
