Moved comment to the right place and added a TODO. Added another comment about the documentation task.

Set CCACHE_CPP2 environment variable to yes as described in http://petereisentraut.blogspot.co.il/2011/09/ccache-and-clang-part-2.html

Workaround clang and ccache bugs described in http://petereisentraut.blogspot.co.il/2011/05/ccache-and-clang.html

encodings.h: fix typo in preprocessor condition (closes #494)

https://github.com/travis-ci/travis-ci/issues/5225

detect little endian for Microsoft ARM targets

When _MSC_VER and _M_ARM is defined, this is some Windows ARM target
using little-endian byte order.

use <wchar.h> with C++ linkage on Windows ARM

Instead of commenting that we should, just do include <wchar.h>
with C++ linkage when compiling for Windows on ARM.
Actually, omitting the C linkage really should be enough here.

Fix #483 by using the correct value type

fix typos and dead links in docs

GenericDocument: add implicit conversion to ParseResult