v7

$ git log v6..v7 --oneline
35e4b41 (HEAD -> master, tag: v7, origin/master) bump to v7
b06656d add --ignore-errors option for skipping over files that cannot be processed. This option has an effect only when combined with r (--recursive)
055d0a1 change default output image format to jpg
8a70256 discard alpha channel before writing output image
22a11b4 work around python-pillow crash on font getsize() on empty strings. close #43
8015488 display default values in help
2275c87 Allow specification of number of columns with manual timestamps (#40)
07a16bd close file descriptor after using tempfile.mkstemp(). close #41
21d1411 fallback to pillow's default font
ebb5bdc add --frame-type argument for selecting specific frame types only, for example key frames only
30fac91 travis-ci: test with Python 3.6
2f4bd3e remove support for Python 2.6
81c107d handle empty globs. close #36
892d550 Added glob for wildcards (#34)
98fa917 add timestamp border mode