Update csv-metadata-and-template-for-simple-weather-obs-example.md
separated out notes & schema
Merge branch 'separate-schema' into gh-pages
added example re property types
added column description definition
updated type to datatype in example
examples of different property types
amended column name and added multi-lingual content
fixed json braces
amended metadata document syntax

as per JeniT's suggestions in her [email][1]

[1]: http://lists.w3.org/Archives/Public/public-csv-wg/2014Jun/0103.html
reworded issues
reworded re empty cells in the header
removed reference to `short-name`
fixed typo: "O*NET-SOC" (not "O*NET-SEC")
removed "constraints" object

no longer required to wrap individual constraints
changed key "var" to "name"

aim to be consistent with other usage of "name"