When running configure.sh in Ubuntu, specify python2.7 for virtualenv.
Merge pull request #951 from tortxof/develop

When running configure.sh in Ubuntu, specify python2.7 for virtualenv.
Fix run.ps1 to properly start openbazaar after pull request #889
Merge pull request #958 from yagoulas/fix_win_script

Fix run.ps1 to properly start openbazaar after pull request #889
Use context managers properly.
Groom imports.
Properly process sys.argv. Fix #956.
Install a main function.
Used argparse to parse the arguments