Change External to NonEmbedded

In line with the name change on github, fixes #15
Add more information to README
Explains not embedded and fixes a typo or two
Merge pull request #19 from IATI/improve_readme

Explains not embedded and fixes a typo or two
Update BudgetType.xml

Changed fr to en - seemed to be a mistake
Add mappings to json coversion
Include JSON and XML mapping files in output
Add license for the code in this repository
[#9] Add basic support for old XML format
Add legacy CSV and JSON support also
Normalize whitespace in codelist fields, fixes #16
[#9] Generate compatible codelist index files
Merge branch 'master' into 1.04dev