-updated "make docs" command information.

Change-Id: Id102998481e15327980221586aef528edb541b6c
Reviewed-by: Jing Bai <jing.bai@digia.com>

Change-Id: Id0359856e31602307db0cac789b4beee3bc2d081
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Reviewed-by: Martin Smith <martin.smith@digia.com>

There is a known issue that building to a prefix does not work.

Change-Id: Ic1ee1751ead868dc003c3fdd48d96d8621ecfae8
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jerome Pasion <jerome.pasion@nokia.com>

-Changed qdoc3 build rule to place the binary in qtdoc/bin/
-Created a rule to run 'make qmake' so that qdoc3 finds the modules
-Added a README file

Change-Id: I2402799cf84b970a8102f313fcd016b140acdcba
Reviewed-on: http://codereview.qt.nokia.com/4213


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>