Add command line parameter -o to specify the file name of the snapshot #2

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ChanningBJ wants to merge 4 commits intolinuxdeepin-packages:masterfrom

ChanningBJ:master

Commits on Apr 10, 2014

can save to file

chengming
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chengming
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-f and -w also support -o

chengming
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delete comments

chengming
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chengming
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Commits on Apr 22, 2014

When choose to save the picture, open the path that is used last time
chengming
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