Add safety picture using in some classes.
temporary fix for locale dependent json formatting
Merge branch 'master' of https://github.com/gecube/opencaesar3
GameDate in own class now.
ComputerCity now create one merchant in 3 month.
City merchant logic improved. renamed Propagator::ReachedBuldings -> Propagator::Ways.
EmpireMap save offset in AppConfig. CityMerchant now may sell/buy goods in warehouse. Merchant Warehouse finding alg improved.
Merge branch 'fix/json-locale-dependent' of https://github.com/nickers/opencaesar3
CityMerchant logic improved. Now sell/buy goods.
Fixed ansi to float converting.
Trading improved. Merchant use city import/export orders.
mingw fix add. zip archive reader add, prepare for exclude dependence from libarchive and use direct work with zlib.
Gcc fix(Issue #5)
Remove dependence from libarchive. Use native zlib for work with pics*.zip. Improved VFS for mount archives such folder. Refactoring picture manager, now load only needed picture runtime. add mingw 4.8 support.
Merge pull request #188 from dalerank/master

mingw 4.8 support. new picture manager. VFS upgrade.
Remove dependence from SDL_image which using for load png files. Add own png loader for direct using libpng.
Improved FileList dir listing. fixed (Issue #190)
refactoring overlay drawing. Set tile picture constant pointer. Add
options image to BuildingData for use it in construction.model, but not
hardcode.
Use current directory as fallback application directory

With this more sane paths are generated, e.g. ./resources/foo instead
of /resources/foo
Citizens name generator add.