Feature/observe dot timestamp

[wangyoucao577]

Issue

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#122

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Tasklist

• CHANGELOG.md entry (How to write a changelog entry)
• update relevant Wiki pages
• add tests (see testing documentation
• review
• adjust for comments
• cherry pick to release branch

Requirements / Relations

Link any requirements here. Other pull requests this PR is based on?

doc: https://github.com/Telenav/open-source-spec/blob/master/osrm/doc/osrm-toolchain-files/map.osrm.timestamp.md

[CodeBear801]

Just some discussion for osrm-extractor

• Each osrm suffix will implement a content file, and inside of them will implement interface from ContentsOperator
• Inside each xxx/content.go, it will define data schema for the contents inside of which.
• Important logic is here _, err := io.Copy(writer, tr);, by writer from each element, we deserialized data object.

[wangyoucao577]

Just some discussion for osrm-extractor

• Each osrm suffix will implement a content file, and inside of them will implement interface from ContentsOperator
• Inside each xxx/content.go, it will define data schema for the contents inside of which.
• Important logic is here _, err := io.Copy(writer, tr);, by writer from each element, we deserialized data object.

Yes!