Replaced archive command to use raw git commands instead of gitpython
get active branch from local git command
get commit by name using local git commands
Missing import
removed gitpython dependency
support escaping spaces in archive directory / file names
use HEAD in lieu of interpreting output from the `git branch` command
wrap git command to prevent abnormal termination of the program
unindent for readability
Merge pull request #7 from onefinestay/gitless

remove gitpython dependency