log to file by default

add extras dependency on python futures

We do this to build our own wheels since
the boto3 wheel is broken. See:
boto/boto3#127
#23

Merge pull request #22 from longaccess/ignore

support .gitignore like files when uploading

new management features release

New `bgst` commands:

* info - shows info about an archive
* notifications - shows account notifications

Merge pull request #18 from vrypan/newapi

Bux fix: handle unicode archive titles