Added 1.7.2 biomes and trees.
Added rotate/flip/cycle data for 1.7.2 blocks.
Allow forest generator to make trees under snow tiles.
The /green command no longer affects permadirt and podzol.

This behaviour can be overridden with -f.
Revert /up and /ceil command to use glass block by default. Flight can be done via -f flag now.
Added config option to set the default for the /up and /ceil commands.

The config option defaults to glass as that is consistent across gamemodes.
Use -f to force flight (if available).
Use -g to force glass.
Merge branch 'master' of git://github.com/sk89q/worldedit

Conflicts:
	src/main/java/com/sk89q/worldedit/EditSession.java
	src/main/java/com/sk89q/worldedit/commands/NavigationCommands.java
	src/main/java/com/sk89q/worldedit/commands/UtilityCommands.java