Clarify unfunded offer deletion strategy.
When compiling debug builds with GCC use _FORTIFY_SOURCE=2:
This gcc/glibc feature adds some (supposedly) lightweight checks which can
help detect errors such as buffer overflows.
Account for high-ascii (RIPD-464)
Properly handle edge-cases when parsing JSON integers (RIPD-470):
* Properly handle both unsigned and signed integers
* Return parsing error for overlong JSON numbers
* Implement unit test checking the edge cases that are of interest
Handle changes to boost::optional in newly released boost 1.56:
To improve compatibility with the proposed std::optional a number
of changes were made, one of which is the removal of the implicit
conversion to bool.  As a result, returning boost::optional as a
bool value now fails.  Explicit conversion to bool used for clarity.
JSON cleanups:
* Fix Json headers to include what they use.
* Get rid of ripple/json/api directory.
Enable heap profiling with jemalloc:
The jemalloc library (which must be downloaded and installed separately)
is required to perform heap profiling. Instructions on how to enable heap
profiling with rippled are available in doc/HeapProfiling.md
Fix move constructor of aged_unordered_container (RIPD-490)
Fix exception safety in aged containers
Use aged containers in Validators module (RIPD-349)
Tidy up sources
Add validators aged container test
src/README.md:  s/addded/added/
Clean up some docs
* Consistent line endings in rippled-example.cfg
* Rewrite CodingStyle.md. Get down to top priorities
Fix warnings and compile errors
Compile git tags now include name and branch (RIPD-493)