fix minor issues

fix minor issues

fix build and alignment issues (microsoft#200,microsoft#202,microsoft…

…#203,microsoft#204,microsoft#206)

fix potential leak, heap block overflow detection, page reset enabled

improve free performance, minor bug fixes

stable release 1.4: improved page reset, stl allocator, bug fixes

stable release 1.3: improved randomness, stronger free-list encoding,…

… various bug fixes

fix issue microsoft#184

fix issue microsoft#179

stable release 1.2: improved security