Merge pull request #2 from Cybjit/master

CMap fixes and speed improvements
version 20140915 pushed to PyPi as pdfminer_six
forgot 'six' requirement ...
renamed as pdfminer.six in PyPi
add python3 in sample Makefile
clean up HTMLConverter and XMLConverter encoding
fix dict_value usage in strict mode
keep password api unicode, latin1 or utf-8 is encoded in handler
password py3
apply_png_predictor py3
guess argv encoding in py2 with sys.stdin.encoding
more xrange to range