[reference/visualization][s]: improve intro paragraph and add a couple of js libraries.
[what-is-data][s]: minor tweaks and proffing.
[visualization][xs]: typo.
Merge branch 'master' of github.com:okfn/datawrangling
Merge branch 'master' of github.com:okfn/datawrangling
Merge branch 'dev'
added recipe searching for raw data
added section author info
Merge branch 'dev'
Merge branch 'dev'
Merge branch 'dev'
Merge branch 'dev'
moved rdf to rdf-reference for wordpress deployment
Merge branch 'dev'
Merge branch 'dev'
Merge branch 'dev'
added scraping to the glossary
Update text/recipes/scraping.rst

Changed "recieve" to "receive"
Update text/recipes/sql-for-data-manipulation.rst

- Deleted "that": that that's 

- Added apostrophe in won't: "wont affect"
Update text/recipes/publishing-data-on-the-datahub.rst

Fixed various typos:

-For this purposes
-If you don't have one to hand
-upload or links to data