Update Vagrant download url to 1.4.2 - #17

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Bump version to 1.4.2 in vagrant.nuspec - #17

Fix #17: Update Vagrant to 1.4.2

Signed-off-by: Rogerio Prado de Jesus <rogeriopradoj@gmail.com>
Merge pull request #18 from rogeriopradoj/fix-17

Fix #17: Update Vagrant to 1.4.2