Releasing little fixes and improvements as 1.5.3.
Will concentrate on bigger refactoring...
Added workaround in CMakeLists.txt to handle different C++11 compiler flags.
Made the marker tool also recursively parse json text line object.
(Forgot to also parse the objects in the 'extra' array, parsed only the
'text' string)
Updated readme with new bugfixes.
Tweaked readme a bit.
Fixed bug in texture extraction script.
(Forgot a "return True" in imagemagick detection)
Also update mouse pos control widget on mousedown.
Should work on touch devices now too.
Added warning if old 'rendermode' instead of 'render_mode' is used.
Also changed 'rendermode' to 'render mode' in documentation.
Fixed typo s/Therefor/Therefore/
Forgot to initialize dleft and dright in IsometricBlockImages.
Trying to implement mc <--> latLng in web interface.
Merge branch 'master' into big-fat-refactoring