Merge pull request #218 from NSDex/master

Don't add empty 'extra' fields to chat msg JSON
Added Basic GlassBlock Class
Merge pull request #220 from Seferan/master

Added Basic GlassBlock Class
Fixed Sound for GlassBlock
Merge pull request #221 from Seferan/master

Fixed Sound for GlassBlock
Merge branch 'master' of https://github.com/SirCmpwn/Craft.Net

Conflicts:
	source/Craft.Net.Logic/Blocks/GlassBlock.cs
	source/Craft.Net.Logic/Craft.Net.Logic.csproj
Fixed conflicts for upcoming merge