Update Vagrant download url to 1.4.1 - #15

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Bump version to 1.4.1 in vagrant.nuspec - #15

Fix #15: Update Vagrant to 1.4.1

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Merge pull request #16 from rogeriopradoj/fix-15

Fix #15: Update Vagrant to 1.4.1