Merge branch '4.7' of scm.dev.nokia.troll.no:qt/qt-doc-staging into 4.7-integration

Merge branch '4.7' of scm.dev.nokia.troll.no:qt/qt-doc-staging into 4.7-integration

* '4.7' of scm.dev.nokia.troll.no:qt/qt-doc-staging:
  Doc: Clarified the range of return values from QLineF::angle().
  Doc: Fixed \since declarations.
  Doc: Standardized on QtQuick for \since declarations.
  Doc: Removed whitespace.
  Modified \since command behavior slightly to handle project and version.
  Doc: Added a simple introduction to Qt and fixed links.
  Doc: Added more appropriate links to help reduce confusion.
  Doc: Removed non-ASCII characters from the documentation.
  qdoc: Fixed QTBUG-19338