Include BeastConfig.h from the root include path
Add ledger_get RPC command to fetch a ledger from the network

Conflicts:
	Builds/VisualStudio2013/RippleD.vcxproj
	Builds/VisualStudio2013/RippleD.vcxproj.filters
	Builds/VisualStudio2013/RippleD2.vcxproj
	Builds/VisualStudio2013/RippleD2.vcxproj.filters
	src/ripple_rpc/impl/Handlers.cpp
Rearrange branch in accordance with new practices.
Clean up RPC messages from Main
Rename ledger_get to ledger_request.
Clean up LookupLedger and resolve issue 278.

* Use beast::zero to resolve issue 278.
* Rename variables and simplify logic.
* Restrict to 80 columns.
Add newer validators to validators-example.txt
Further cleanups of RippleCalc.

* Rename many variables.
* Make most of PathState private.
* Extract out common Node::isAccount() code.
* Rename bConsumed to allLiquidityConsumed_.
* Extract out code into PathState::clear().
[WIP] Add a new PartitionMap.
This will eventually replace the static linked list of LogPartition stored within LogPartition.
[WIP] Experimenting with plugging in PartitionMap
Not ready for prime time.
[WIP] Move logfile into the application.
Also beginning to isolate LogSink in anticipation of removing it.
[WIP] Move logging data from application to config object.
This is necessary because we need to log from a ripppled
which is parsing rpc commands, and this instance does not
have an application object.

WriteLog has been preliminarily hooked into the new Log
object (temporarily named NLog), and tests are showing that
logging is generally working as desired.

beast::Journal now needs to be pointed at NLog, and Journal
should not maintain its own partition map data (e.g.
partition severity thresholds).
[WIP] Move ShouldLog and CondLog over.