Added astrotools label for potential reference
Added label to AstroTaverna website for future reference
Added extensions to the .gitignore configuration
Added reference to astrotavgit
Added reference to Taverna Astronomy Edition
Added reference to AstroTaverna Users mailing list
Created a hrefnotelabel command

The \hrefnotelabel command allows for back references to the note.
Putting the \label inside the text returned the number of the section
the footnote was in.
Added footnote reference instead of hrefnote
Fixed inconsistencies
Merge branch 'issue_17_bis', fixing inconsistency with master and issue_17