Replace Journal public data members with member function accessors
in order to make Journal lighter weight. The change makes a
Journal cheaper to pass by value.
Also add missing stream checks (e.g., calls to JLOG) to avoid
text processing that ultimately will not be stored in the log.
* A new, unified interface for generating random numbers and
filling buffers supporting any engine that fits the
UniformRandomNumberGenerator concept;
* Automatically seeded replacement for rand using the fast
xorshift+ PRNG engine;
* A CSPRNG engine that can be used with the new framework
when needing to to generate cryptographically secure
randomness.
* Unit test cleanups to work with new engine.
* Remove cxx14 compatibility layer from ripple
* Update travis to clang 3.6 and drop gcc 4.8
* Remove unneeded beast CXX14 defines
* Do not run clang build with gdb with travis
* Update circle ci to clang 3.6 & gcc-5
* Don't run rippled in gdb, clang builds crash gdb
* Staticly link libstdc++, boost, ssl, & protobuf
* Support builds on ubuntu 15.10
