General tidy and refactoring:
* Use nullptr (C++11) instead of NULL.
* Put each file into its own namespace declaration.
* Remove "using namespace" directives and add scope qualifiers.
* Control when beast's implementation of std::equal (C++14) is used.
* Tidy up some const declarations.

Conflicts:
	src/ripple_app/shamap/SHAMapSync.cpp
	src/ripple_app/tx/TransactionEngine.cpp
Change to the treatment of BeastConfig.h
* No longer requires its own compiler include path
* Includes use relative paths to locate the file
* Client applications include the file themselves
* Inclusion of BeastConfig.h can be controlled via preprocessor directive
Add workaround/noexcept.h for visual studio
Add abstract streams module:
* New basic_abstract_ostream template for generic output
* New abstract_ostream, common type alias
* basic_scoped_ostream, RAII output to abstract streams
Fix error code assignment in raw_parser
Fix and add tests for empty_base_optimization.
Update to SQLite 3.8.4.1
beast cleaning and tidying:
* Consolidate small modules into one
* Remove Android-specific platform support
* Remove Chrono.h from beast_core.h
* Removed files:
  - TypeTraits.h
  - Utility.h
  - Net.h
  - Asio.h
* Remove zlib support:
  - Remove inline zlib library sources
  - Remove GZIPCompressorOutputStream
  - Remove GZIPDecompressorInputStream
* Remove obsolete or unused classes:
  - BigInteger
  - BufferedInputStream
  - CacheLine
  - CPUMeter
  - DatagramSocket
  - DynamicObject
  - FileLogger
  - FPUFlags
  - Identifier
  - JSON
  - LocalisedStrings
  - MACAddress
  - MemoryAlignment
  - MemoryInputStream
  - MemoryMappedFile
  - NamedValueSet
  - OptionalScopedPointer
  - PerformanceCounter
  - PropertySet
  - ScopedTimeInterval
  - SparseSet
  - SpinDelay
  - StreamingSocket
  - StringPool
  - SubregionStream
  - Uuid
  - Variant
Add const_container
beast.streams improvements:
* New basic_std_ostream wraps any std::stream.
* New debug_ostream redirects output to debugger if attached.
New unit_test framework:
* Header-only!
* No external dependencies or other beast modules
* Compilation options allow for:
  - Stand-alone application to run a single test suite
  - Stand-alone application to run a set of test suites
  - Global suite of tests inline with the host application
  - Disable test suite generation completely
Refactor ECDSA canonical checks
[FOLD] Fix typo
[FOLD/TX-REFAC] Transactor include guard fixup
[FOLD/TX-REFAC] WalletAdd Transactor journal
[FOLD/TX-REFAC] TrustSet Transactor journal
[FOLD/TX-REFAC] RegularKeySet Transactor journal
[FOLD/TX-REFAC] Payment Transactor journal
[FOLD/TX-REFAC] OfferCancel Transactor journal
[FOLD/TX-REFAC] Change Transactor journal