Merge pull request #119 from graphitefriction/table-attr-additions

expanded table section of user manual
expanded data format and table format sections

- provided additional data format examples
- added a tracks.csv file so the include:: directive works
- added column width specifier examples
- add section on table width and frame
- added footer section
- rearranged sub-section order
- minor copyedits to text and examples
- resolves issue https://github.com/asciidoctor/asciidoctor-documentation/issues/23