Doc: Converted "installation" group to a regular page.

-regular page doesn't list the group members, allowing extra content
to be listed and gives control on the layout of information
-renamed "Installation" to "Building Qt Sources" as it is a more precise
 name
-Added links to the "Building Qt Sources" page where it makes sense.

Change-Id: I074bc5c17edf2bc096bcfc8f6d102b469929ede0
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Nico Vertriest <nico.vertriest@digia.com>
Reviewed-by: Martin Smith <martin.smith@digia.com>
Doc: Reworded description of Qt Creator.

-old description is too long

Change-Id: I706a5905c38c36383f2f18cab1620e979c1a86e5
Reviewed-by: Martin Smith <martin.smith@digia.com>
Doc: Fixed WS error in Windows platform page.

-missing space after a full stop.

Change-Id: Ibb81668aa3cd9e67f7289b45ca22947c9cc40be3
Reviewed-by: Martin Smith <martin.smith@digia.com>
Doc: Update the iOS platform notes

Task-number: QTBUG-33592
Change-Id: I85ec660dd09c3790d8e11294e72487a90e76dfb1
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Doc: Fix broken link in Supported Platforms page

Change-Id: If9b0ec834aba3ab202876df3ab86882ff8b25a23
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Doc: Fixed broken links to Android and iOS pages.

-the titles changed but the links didn't.

Change-Id: Ifa8fd05a59db137e9d3bc93d67c836d440d86907
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Doc: Removed "WinRT" from the list of supported platforms.

The port did not make the 5.2 deadline.

Change-Id: I452cb4e16663ab3fd3f8f62c2eb1ef5a56766e97
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>
Doc: Integrated the build instructions from the wiki

Reorganized the existing content to accommodate the build
instructions in the Qt5ForAndroidBuilding wiki page.

Task-number: QTBUG-33580
Change-Id: I49f54413cecdfa878a4271032ef38e028c6b315f
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Doc: Adjusting "Core Internals" and children documentation's links

-moved the links out of the paragraphs and into lists because
 the links with the visible text creates confusion
-fixed other links so they point to the correct material.

Task-number: QTBUG-32173
Change-Id: I390aece0aef599fb841730392ced70665fc4f523
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>
Doc: Fixed deployment section in Supported Platforms page.

-Fixed broken links
-Added iOS and Android deployment links as well

Change-Id: I32cda86669d50c4dc5728c70387dd264a628537a
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I12f36a8170b5b06e0b48b58a95126526b2845a86