Added wget flag to reset connection

[Manouchehri]

Since install-sh.sh is a part of the install process, we probably don't want to wait for the long default of 15 minutes (bcbio/bcbio-nextgen#1487).

Was having issues on my build box before applying this change (connections to *.s3.amazonaws.com kept hanging).

[s3rvac]

Thank you for the suggestion. I agree that setting --read-timeout to a lower-than-default value may be desirable. However, do we really want it to be set to a single second? Shouldn't we set it to, say, 10 seconds? Otherwise, if there is ever a one-second read delay during the download process, the entire download gets restarted. That seems pretty harsh to me :-).

[Manouchehri]

Done.

[s3rvac]

Thank you. Could you please squash all the commits together and base the resulting commit on the current origin/master?

[Manouchehri]

Done!

[s3rvac]

Thanks!