- opts.bookDeps parses calc chain; now chains are not parsed by default
- getzipdata safe option obviates some try-catch blocks
- parsing cell type 'd' (h/t @malphettes, yet again :)
- opts.WTF throws on errors
- cellHTML controls HTML generation
- cellFormula controls formula output
- sheetStubs now defaults to false
- cleaned up unnecessary CSV quotes (fixed#45)
- updated test_files to 20140211
- updated SSF to 0.5.7
- removed unused main function
- removed some dead code