refactored DefaultPrefixManager constructors
update for github releases
Update release notes for 3.4.5
Create README.md
3577999 : Extend Namespaces enum with common prefixes
Add isBuiltIn
Added .idea to .gitignore
Changed getBaseIRI to getPrefixIRI
Add RDFa Core Initial Context prefixes
Add profile IRIs
Added more well known namespaces, removed non-explanatory comments
Tidying of javadoc
Added enum for status and use
added javadoc generation