Added some documentation to index and moved tag parsing functions
Added some documentation for the config class
Merge branch 'master' of https://github.com/grape-pipeline/grape
Using number for quality offset
Changed option --add to --set for grape config
Added IndexEntry class
Added test file for index
Added index file support - reading
Merge branch 'master' of https://github.com/grape-pipeline/grape
Added import from tsv
Modified index import to cope with tsv and csv
Merge branch 'master' of https://github.com/grape-pipeline/grape
Initial usage of data index and config