Merge pull request #25 from xambroz/patch-1

Update version.py

Merge pull request #19 from WaryWolf/master

add commandline arguments '-s' and '-o dir' to optionally output each parsed record to its own text file in a given folder.

main: flush buffered records as they are recovered

main: don't use buffing `print` to output footer

utils: better handle failure case in mmap handling

version: bump to 0.2.3

main: fix reference error

carvers: make more robust by handling more exceptions

main: add xml header and wrapper element

readme: add nightly download links

main: write raw bytes to stdout

travis: don't push pyinstaller intermediate files to buildartifacts

travis: update s3 secure creds