GA release v1.0.42

Changes since 1.0.40: v1.0.40...v1.0.42

Notable:

• Support for 5.7 JSON data type
• Write optimization: client side prepares statements, reduce network traffic overhead, #459
• Read optimization: avoid generating temporary tables in read query, #471 thanks @ggunson
• Using autocommit=1, fixes #480, thanks @renecannao
• Added --force-table-names controlling, see #457, thanks @arthurnn
• Validating password length (capped at 32, see #489)
• Stricter data type validation pre-migration
• more...

Thank you kindly to all contributors!

$ md5sum *
07617a0058396336d0d0686253ae602d  gh-ost-binary-linux-20170914095800.tar.gz
673574c92bf18921625758a05e0bed98  gh-ost-binary-osx-20170914095800.tar.gz

$ sha1sum *
444589e9417653a8636838cb6ecbe7fb908e7609  gh-ost-binary-linux-20170914095800.tar.gz
9a79e741ea28e1f55d7cf49b9813f151d4b52362  gh-ost-binary-osx-20170914095800.tar.gz

$ sha256sum *
297b14ed1efe9b894e27e63f7aff36ceded7334c174f5a8602af9e74beb2f512  gh-ost-binary-linux-20170914095800.tar.gz
0fd2497b21305dbd420f94d61703a33a70fcf2b0b54bbfb55e178691d061ff2d  gh-ost-binary-osx-20170914095800.tar.gz