merged from 1.6.5

gcc-4.6 in Travis

and clang-3.0, the default

fix open-source-parsers#290

1.6.2 <- 1.6.1

Fix UTF-8 for old (deprecated) Writers.

* Do not truncate at embedded zeroes.

partially revert 'Added features that allow the reader to accept comm…

…on non-standard JSON.'

revert '642befc836ac5093b528e7d8b4fd66b66735a98c',
but keep the *added* methods for `decodedNumber()` and `decodedDouble()`.

1.6.1 <- 1.6.0

partially revert 'Added features that allow the reader to accept comm…

…on non-standard JSON.'

revert '642befc836ac5093b528e7d8b4fd66b66735a98c',
but keep the *added* methods for `decodedNumber()` and `decodedDouble()`.

Merge pull request open-source-parsers#221 from btolfa/forgotten-virt…

…ual-dtor

Added forgotten virtual dtor for `Json::CharReader::Factory`.

(Without this, the destructor of the derived `CharReaderBuilder` would not be called, which is a small memory leak.)

partially revert 'Added features that allow the reader to accept comm…

…on non-standard JSON.'

revert '642befc836ac5093b528e7d8b4fd66b66735a98c',
but keep the *added* methods for `decodedNumber()` and `decodedDouble()`.