Fix #72

travis-doxygen.sh: only overwrite .git-credentials, iff not exists

It is simple and pure C++. And it is found in performance test that it
is even faster than the original version, due to distribution of n. But
the performance gain is not obvious in RapidJSON.

typo

Modified from Milo's Grisu2 implementation. 99.9% cases return shortest
decimal format.

Accurate rounding in normal numerical ranges, also reduce lookup table
size.

Fix #94

Fix #91

premake.lua: relax warnings for GTest and perftest (fixes #86)

For the "test" solution, the "gtest" and "perftest" projects contain
third-party code.  Relax the warning settings for "gmake" for these
projects to avoid build failures due to third-party code.

Remove for object members, some cleanups for values

This reverts commit 9ab2621e.

As std::vector::erase() overloads added in C++11

Fix parsing numbers which are less than 1e-308