Update Vagrant download url to 1.3.3 - #7

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Bump version to 1.3.3 in vagrant.nuspec - #7

Fix #7: Update Vagrant to 1.3.3

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Merge pull request #8 from rogeriopradoj/fix-7

Fix #7: Update Vagrant to 1.3.3