Merge pull request #5 from derFunk/patch-1

updated download link to match the README documentation

Merge pull request #3 from dougborg/patch-1

Add missing error checking for Render() call

Remove format string from log statement

Add notes on environment variables to README

Merge pull request #2 from bdupras/allenv

added -E flag to pass through all environment variables

Add -r flag to specify root

Use same mode for target as for source

Resolve path to command

Add support to keep environment

Update README.md

first commit