Merge pull request #574 from davidhassell/release-CF-1.12

Editorial changes for the CF-1.12 release documents

Update apph.adoc

Revert erroneous change from merge conflict

Merge pull request #495 from JonathanGregory/units_metadata_defect

corrections to units_metadata text

Set date for CF-1.10

Change version to 1.9

Merge pull request #227 from davidhassell/conformance_2.3

2.3 must -> should

Merge pull request #123 from cf-convention/marqh-wqtdetails

Slight formatting improvement to marqh's changes, and history update

Merge pull request #123 from cf-convention/marqh-wqtdetails

Slight formatting improvement to marqh's changes, and history update

Merge pull request #58 from rhattersley/switch-build

Target builds at gh-pages branch.