Fix typo in README.md

aditional -> additional
Merge pull request #415 from JasonPunyon/patch-1

Fix typo in README.md
Bump version number in dokku-installer.rb

Just bumping the version number to bring it up-to-date with the rest of the project.
Recommend 12.04 due to 13.04's EOL
SSL -> TLS
update copyright year
Added option to set memory size for vagrant
Merge pull request #454 from dmyers/vagrant-memory

Added option to set memory size for vagrant
Merge pull request #443 from gdi2290/patch-1

update copyright year
Merge pull request #440 from imchairmanm/patch-1

Bump version number in dokku-installer.rb
Using logs --follow instead of attaching to instance
If passing -t for tail, use logs --follow else just get last 100 lines
Merge pull request #467 from silasb/fixing-log-tail

Using logs --follow instead of attaching to instance
Update stable's version
Update PREBUILT_STACK_URL
Follow redirects
No need for `bin/`. (see also: acf2dfa73a2923a3491b3cbd519f608c94371766)
Fix typo.

prefered -> preferred
Merge pull request #475 from alimony/patch-1

Fix typo.
Ensure the app is really running before killing it