Check pending blocks before falling back to world. Fixes BUKKIT-5122

When growing trees we use a BlockChangeDelegate which queues up the block
changes so plugins can modify/block/log tree growing. However, we always
check the actual world when checking for existing blocks. This means when
the tree growing code checks to see if putting a leaf in a block is valid
it may incorrectly overwrite a log block that should exist in that
location. To ensure trees grow correctly we now check the delegate itself
for blocks that match the queried location before checking the world.
Process URLs as clickable. Adds BUKKIT-4917

In Minecraft 1.7, URL processing was removed from the client while the
server gained the ability to designate a URL to be launched in response to
clicking text. However, this functionality is not implemented in the
vanilla server. This commit adds that functionality to messages sent to
the client, processing URLs as clickable.

Additionally, char array iteration is replaced with regex.
Add new setResourcePack method. Fixes BUKKIT-5015

Minecraft now uses resource packs instead of texture packs, which broke
the setTexturePack method, as the client no longer listens on the MC|TPack
channel.

This commit fixes the issue by adding in a setResourcePack method, and by
deprecating setTexturePack and rewriting it to call the newly added
setResourcePack.  In order to simplify the method and prevent this from
happening in the future, setResourcePack calls EntityPlayer.a(String) to use
the same logic as minecraft when sending resource packs.
[Bleeding] Correctly generate torches on portal. Fixes BUKKIT-746

In the CraftBlockState implementation, updating the blockstate onto
a block will force the block state data value onto the block.
Unlike vanilla which relied on block data being set when the type
changed, we must instead explicitely set the data in the blockstate.
Updated version to 1.7.2-R0.1 in pom.xml for Beta.