Add file-level documentation
Add Report-Msgid-Bugs-To field
Add extra Poedit fields.
Add version as a reminder
Tweak order of fields

Puts all of the Poedit fields together.
Add X_Textdomain-Support field
Remove duplicate Keyword _n
Add missing Keywords
Update contact details for consistency
Merge pull request #1 from GaryJones/patch-1

Multiple fixes props @GaryJones