Updating to latest "pass" on Ubuntu 14.04

The password manager "pass" is in Ubuntu's repository, but the version on 14.04 is quite old and does not support e.g. the "find" command ("pass find somesite.com", where "somesite.com" is in a subfolder of the password store).

To get the latest and greatest version:

1. Install tree v1.7.0

2. Download pass v1.6.5 (tarball)

3. unxz password-store-1.6.5.tar.xz

4. tar xf password-store-1.6.5.tar

5. cd password-store-1.6.5

6. sudo make install