Bump version to 0.3.9
Update docs for new buffer option
Add support for DOCX files as Buffer objects

Essentially skips readFile() if the DOCX file is already a Buffer object. This is useful for passing in in-memory conversions from other document types or other cases where the DOCX file is already available as a Buffer.
Add tests for the buffer option.

Tests both mammoth.convertToHtml() and mammoth.extractRawText()
Update tests (fix spacing)
Change version back to 0.3.8

... so it doesn't throw mwilliamson/mammoth.js out of sync.
Add path module import
Merge pull request #1 from studiochris/docx-as-buffer

Add Docx as buffer