WebSandboxMC

• Add placeable glowing stone block from web client, translates to Glowstone on server (GH-42)
• Add experimental http.takeover option for use with server hosts only allowing one port

Update to NetCraft build 255:

• Change to hold mouse button down to mine/build continuously with a repeat rate, instead of clicking once (satoshinm/NetCraft#8)
• Add block hardness, certain block types mine faster than others (satoshinm/NetCraft#17)
• Add targeted block position and type to info text (satoshinm/NetCraft#66)
• Add dropping files into the game to change textures (.png texture atlas only) (satoshinm/NetCraft#93)
• Add a new block: glowing stone, id 64 (last) always illuminated at level 15 (satoshinm/NetCraft#98)
• Fix possible errors with SQLite dependency when connecting to online servers by disabling cache (satoshinm/NetCraft#2)
• Fix placing blocks over plants, right-clicking now replaces the plant instead of doing nothing (satoshinm/NetCraft#34)