Delete forcefully temp file for bashDump

[liuml07]

If the user sets alias alias rm "rm -i" to be protective about delete files, it will prompt every time we run sdk command. It's better to just forcefully delete the temp file.

[reitzig]

It's not feasible to account for all ways users may think to override any of the "basic" commands in use; see also #23. I recommend to not do that.

FWIW, the fix put forth in #37 -- using command -- seems more appropriate.