ZoneFragment.java : java doc improvement
DrawZoneView : java documentation improvement
Zone : java documentation improvement
Merge pull request #99 from gab-y/dev

Javadoc
Merge pull request #98 from SebastienCohendet/dev

Change view of photos in loadphotos
set button to update to update materials at gone before solving the bug
Merge pull request #100 from nicolasdavid/dev

set button to update to update materials at gone before solving the bug
fixing material and element type import issue
Merge pull request #102 from nicolasdavid/dev

fixing material and element type import issue
Add some Javadoc