1. supporting assignment for rawbuf_builder

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Update README.md

supporting list containter.

Merge branch 'master' of https://github.com/yuanzhubi/raw_buffer

supporting push_alloc

Delete test_proto.h

supporting first containter queue.

Merge branch 'master' of https://github.com/yuanzhubi/raw_buffer

enhanced safety check for array using variable length.

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Update README.md

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Update test.cpp

support variable length integer as optional fields.