h/t @volodymyrl

- updated codepage to 1.3.1 (h/t @volodymyrl)

The original push showed up as failed, pushing again

- jscs linting to check for trailing comma issues (h/t @altkatz)
- IE: phased out lazy string indexing in favor of charCodeAt
- XLSX: replaced certain operations in hot functions with faster alternatives
- updated SSF to 0.7.1
- improved coverage in tests

- eliminated functional constructs in hot functions
- format try-catch block extracted into new function
- cpexcel + codepage updated to 1.2.0
- more efficient (and correct) clean implementation of RGB/HSL/tint algorithms
- xlsx binary --all option enables every extra formatting and saving option
- column widths parsed and saved (requires cellStyles:true)

- basic style + theme parsing, option .cellStyles (h/t @eladxxx)
- more XLSB writing stubs
- correct resolution of .xml/.bin files
- sheet_to_json improvements from js-xls
o opts.header = 1 for array of arrays
o opts.header = 'A' for spreadsheet column labels
o custom opts.header array for custom labels
o opts.range = n starts from row n
o opts.range = range restricts writer to work within the specified range
- Makefile adapted to work with cygwin on windows

- 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

- 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

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

- very basic XLSX / XLSM write support with roundtrip tests (XLSB stubs)
- reorganized source tree
- new XLSB range check ensures that A1 is not emitted for empty sheets
- SSF table emitted in output (consistent with js-xls)
- CLI supports writing

Backwards-incompatible changes:
o new Property aliases (see CORE_PROPS and EXT_PROPS)
o FILETIME custom properties parsed as JS Dates
o `xlsx2csv` -> `xlsx` (and `bin/xlsx{2csv,}.njs`)

- updated SSF to 0.6.5
- XLSB 'dbcs' uses codepage
- README bugfix (h/t @noodles)
- new tests: rawjson and json baselines generated by hand
- single cell ranges are encoded as cells ("A1" instead of "A1:A1") (h/t @clxl)
- source code alignment with js-xls

- XLSX format strings properly handles literal UTF8 chars (test apachepoi_49273)
- codepage updated to 1.0.0
- jszip updated to 2.2.0 (node-only)
- dist now contains jszip and codepage dependencies
- updated test_files