Add -t to boot2docker ssh for creating a tty

Without `-t` in the boot2docker alias, at least I get the error message 

    stdin: is not a tty
Update README.md
Merge pull request #29 from rhuss/patch-1

Add -t to boot2docker ssh for creating a tty
Add Apache2 license (closes #35)
Merge pull request #36 from bsingr/patch-1

Update README.md