version bump 0.7.3: performance

- require cpexcel instead of full codepage library
- hardcode the unescapexml regexp
- utf8read short circuit for ASCII strings
- cellFormulae also acts on XLSX/XLSM
- bin/xlsx.njs do not process formulae unless requested

version bump 0.7.2: bughunt

- read BOM, handle UTF16LE-encoded XML
- handle namespaces in [Content_Types].xml
- parse workbook rels to determine sheet files
- numbers OSX boolean support (apparently requires "0" or "1")
- XLSX force "General" style to be serialized, omit implied cell type and style
- updated SSF to 0.7.0 (h/t @sysarchitect)
- updated jszip to 2.2.2
- removed old tests/files path, replaced with test_files
- themes written
- ignore potential existence of thumbnail when calculating relationship ids

version bump 0.7.1: test now ignores missing files

apparently openpyxl removed a few test files from their suite :/

version bump 0.5.10-b: guard against corrupt SSF

- prevent overriding format code 0
- pivot table styles

adding 0.5.9 dist [ci skip]

version bump 0.5.8: bookFiles, default change

- option bookFiles controls whether zip files and keys are written to object
  *** Default has been flipped from "true" to "false"
- updated SSF to 0.5.8
- updated test_files to 20140216 (tests also look at 2013 XLSB)
- added dist files (make dist)

version bump 0.5.7: WTF-ification

- 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

version bump 0.5.0: changes to cell interface

Cell object stores the formatted text in the `.w` field
- Raw format and types are preserved in the `.t`, `.v` fields
- Accessors have been updated to use the field

updates for older OOXML:
- ECMA-376 makes reference to old sstItem shared string item
- [MS-XLSX] xmlns for workbook

version bump 0.4.3: shared strings and formatting

- XLSB basic support for number formats
- removed extraneous Strings table element
- formatting xml tags (rich_stress_test)
- updating test_files to 20130130