edit and order added tags

[SagarPandit01]

From @graychan on August 1, 2014 14:39

At present, a user cannot edit entered tags and order tags as wished. It is better to allow users to edit and order entered tags, such as,

• erase a tag
• rename a tag
• change tag description
• order tag (which one comes first, which one second)

This issue is a low priority issue.

Copied from original issue: sysnetlab/SensorDataCollector#138