Improve README
Various fixes
Added info about running unit tests with autotest.sh

- Fixes #3
- Added minimum phpunit version
- Added info about autotest.sh for the core app
Added pgsql and missing .sh
Merge pull request #230 from owncloud/stable6-unittestdoc

Added info about running unit tests with autotest.sh
Enhanced PHP module deps order

- reordered modules alphabetically for better readability (for example
  when comparing with a repo package list)
- moved DB modules into own section
Added minimum PostgreSQL version
Use a IANA-managed reserved domain for examples

Using another domain that may be already owned or squatted is not
recommended.
Do not embed a video from an external website

Do not force every documentation reader to fetch data from an external
website not under the administrator control, and consequently open a
privacy breach.
Merge pull request #233 from DavidPrevot/iana

Use a IANA-managed reserved domain for examples
Merge pull request #234 from DavidPrevot/no-youtube

Do not embed a video from an external website
Fix redirection to keeping addressbook

Since address book is replaced with addressbook, the redirection was
problematic. This should solve this problem.
Merge pull request #235 from wakeup/stable6

Fix redirection to keeping addressbook
Merge pull request #232 from owncloud/stable6-fixphpdeps

Improved layout of PHP module deps
Do not list curl and libcurl3. These are irrelevant.

This commits is a forward port of:
44d84353522b5a599b43cea6056e92e7726ae1a6
bf26aab24e0334cc2bfff9a4f834adbe4c99f5a2
c34ca50fe92e6d395f61eb7abb4917c8b910765a
Merge pull request #242 from owncloud/stable6-remove-curl

[stable6] Remove curl package from dependency list