Merge pull request #25 from me21/master

Added convenience functions to serialize to QStrings. Added a check to parse numbers to int/uint (smaller than qlonglong/qulonglong)
updated README.md instead of simple README.txt
Merge pull request #27 from joum/master

Updated Documentation
Changed license to GPLv3. Fixed non-uniform indentation and formatting. Added typedefs JsonObject and JsonArray.
Added an example program.
Moved example program into its own directory.
Update README.md
Update README.md
Update README.md
Update README.md
Update json.cpp

Double value conversion fixed.
Merge pull request #29 from cydside/master

Update json.cpp
Added configurable formats for QDate and QDateTime representation.

Signed-off-by: Alexandr Zarubkin <me21@yandex.ru>