Issue23errorcode

Conflicts:
	example/condense/condense.cpp
	include/rapidjson/reader.h
	test/unittest/readertest.cpp

Make stream local copy optimization as trait option per stream type

need ‘typename’ before
‘rapidjson::StreamTraits<InputStream>::StreamCopyType

‘>>’ should be ‘> >’ within a nested template argument list

An unit test is added

Added overloaded functions for default parseFlags

Can write d.Parse(...) instead of d.Parse<0>(...)
Hope to reduce strangeness and confusion for beginner.

Showing the type Value and preventing member lookup twice.

Fixes image path

Fix segfault and build error on Linux

Another instance of casting away constness via C-style cast
has been missed (introduced by #20).

Some early returns were missing after the removal of longjmp in #22.
This has led to segfaults on Linux (confirmed locally).

minor mistake

Added a paragraph about the unicode features

Parse errors is represented as enum type `ParseErrorCode`.
Error texts are optional for user.
Added  `GetParseError_En()` in `error/en.h`, user can localize this file
into other files. User may dynamically change the locale in runtime.

Removal of setjmp()/longjmp()

Compound types (object and array) call ParseString() and ParseValue()
for key and values. If there is parse errors inside those calls, it
should stop continue parsing. Otherwise, it may be possible to continue
parsing and calling handler incorrectly.
For example, in ["a\u,","b"], \u generates an error (it should follow
but 4 hex digits), the parser continues to treat the first comma as
element separator, and treat "," as a JSON string and call the handler.
It may be unacceptable in the application code.

Prepare travis-ci.org integration, fix build on Ubuntu 12.04 LTS

The C++ standard does not include the C99 macros used to set the (U)INT64
constants in document.h and reader.h (see adf66292 and ce1fece2).

Many implementations include their definition when the
__STDC_CONSTANT_MACROS preprocessor symbol is defined.

See e.g. http://www.cprogramdevelop.com/5272623/,
needed to successfully build in travis-ci.org's environment.

Travis CI is a free hosted continuous integration platform for
open-source projects.  It allows automated testing for GitHub-hosted
projects.

This commit adds a corresponding `.travis.yml` configuration file.

Add compatibility section and minor changes about JSON.