GameProfile fixes for Letter

Fixes #61, also fixes #45
Disable hotbar keys for GuiLetter

Fixes #36
removed forum link from readme
Reformed Forestry!

* Updated for BC 6.0.x compatibility
* Re-implemented the Pipes plugin
* Converted to vanilla assets lang system
* Converted to standard gradle file structure
* General warnings cleanup
Fixing merge stuffz
Merge pull request #91 from Parker8283/reformation

Reformed Forestry!
Updated submodules
fixes for mail system.
Remove dead method from hive world gen.

BlockBeehives doesn't have an onBlockPlaced method, and the vanilla method does nothing.
Perhaps junk left over from 1.7 update.
Merge pull request #90 from JamesMitchell/readme

removed forum link from readme
Added assets for known missing textures: royaljelly crate and IC2 silver crate
Removed registration for unknown missing textures:

textures/items/analyzer/natural.png
textures/items/misc/liquid.png
textures/items/misc/empty.png
Updated localizations
Merge branch 'master' of https://github.com/ForestryMC/ForestryMC
Removed redundant function from backpack API. All checks for item validity now use IBackpackDefinition.isItemValid() resulting in more consistent behaivor.
Simplify some of the backpack code and "fix" the localization code so that it isn't prefixing "Woven" in a non-localization friendly way. This is only hack fix though, all the bags will lose the "Woven" prefix entirely until Forestry is converted to the vanilla localization api.
Updating submodule references
Merge branch 'mailSystemFixes' of git://github.com/mezz/ForestryMC into mezz-mailSystemFixes
Merge branch 'mezz-mailSystemFixes'
Fixes to trade system