core: added Wordlist.qml for loading an maintaining GCompris wordlists

The Wordlist element reads GCompris' wordlists from json files. It
expects a json format that is semantically identic to the former xml
format of the Gtk+ version and scetched briefly in comments.

This adds also a converter script (tools/wordlist-xml2json.pl) that
transforms Gtk+ wordlist files from xml to the new json format.
Ported Gletters activity

First version without Android support.

Uses Wordlist.qml for loading wordlist files. No support for multichar
words yet, will come soon.
Merge pull request #23 from hkaelber/integration-master

Gletters: first version
planegame, a more robust move implementation

The helico move is more stable, no more random jumps on touch
screen. On the downside I removed the rotation effect and the
angle is not implemented on tablet.
created algorithm activity.
algorithm, improved code

- better code formatting
- use of common variables and model
- single sound item
algorithm, user interface major rework

Made the items dependend on the window size while keeping the ratio.
Reformatted the image items to be 100x100
Replaced the background image by a desert image from openclipart
Added port of the mosaic activity
Merge branch 'mosaic'
Published android beta 0.8
core, replaced QtQuick control 1.2 by 1.1

The 1.2 import is only available in Qt 5.3 beta. This is not a
good idea to force developers on it yet.
core, replaced QtQuick Window 2.2 by 2.0

The 2.2 import is only available in Qt 5.3 beta. This is not a
good idea to force developers on it yet.
algebra, minor removed extra focus=true
click_on_letter_up, minor removed an extra import
algebra activities, renamed qml in CamelCase
memory-math-mult, minor typo
advanced_colors, renamed qml in CamelCase
click_on_letter, renamed qml in CamelCase
erase, renamed qml in CamelCase
leftright, minor change in comments