fix int overflow
Merge pull request #1226 from WalterBright/fixintoverflow

fix int overflow
Removed deprecated functions from std.path
Update index.d

Fix std.ascii link
Merge pull request #1228 from Safety0ff/patch-1

Fix std.ascii link
Updated unittest.d
Merge pull request #1227 from kyllingstad/std-path-deprecations

Removed deprecated functions from std.path