Merge pull request #16 from jtriley/fix-deprecated-exc-message

fix deprecation warnings about e.message
Merge pull request #17 from jtriley/feature-get-multiple-paths

support fetching multiple files and dirs in get()
get: support single file/directory renames

e.g. scpclient.get('/etc/fstab',  local_path='ec2-fstab')
e.g. scpclient.get('/etc/zsh',  local_path='ec2-zsh-dir')

The above examples will only work provided local_path != cwd and
local_path is not an existing directory.