Merge pull request #1 from qgis/master

Forked source update request
Update foreword.rst
Update modeler_hydro_calculator.rst
Update answers.rst
Quick field calc bar (like Excel) in attribute table
Merge pull request #255 from yjacolin/quickCalcBar

Quick field calc bar (like Excel) in attribute table
Fix #248
Merge pull request #256 from yjacolin/248

Fix #248
Merge pull request #254 from diethard2/master

added example using QGIS startup parameter --code to introduction
Fix dead link and typo from #234
Merge pull request #257 from yjacolin/deadLinks

Fix dead link and typo from #234
Merge pull request #244 from Qgis-Tr-kr/master

Fix broken image links in Training Manual
Explain live update of the color button for print composer.
Merge pull request #258 from yjacolin/master

Explain live update of the color button for print composer.
Remove old widgets, add Date/Time widget and change order to be closer to the one in the interface
Merge pull request #259 from yjacolin/master

Remove old widgets, add Date/Time widget and change order to be closer ...
make script runnable from cron
Label features multiple times
Merge pull request #260 from yjacolin/master

Label features multiple times
Move layer renderer after renderers, add shapeburst and grandient fill.