FIX: issue #921 (Misleading comments on shift operators)
Merge branch 'master' of github.com:red/red
Merge remote-tracking branch 'upstream/master'
DOCS: Fix typo in Red/System Spec
DOCS: Fix typo in Red/System Spec
Merge pull request #942 from WayneTsui/master

DOCS: Fix typo in Red/System Spec
FIX: change Max Ulp to 10 in almost-equal function.

Note: change to 10 according practice experience.
Some math function may produce different result on different arch.
For example.
  On x86 platform, exp 123 -> 2.6195173187490456e53
  On x86_64 platform, exp 123 -> 2.61951731874905e53
FIX: st_blocks is 64 bit in stat64 struct.
Merge pull request #944 from qtxie/max-ulps

FIX: change Max Ulp to 10 in almost-equal function.
Merge pull request #945 from qtxie/stat64

FIX: st_blocks is 64 bit in stat64 struct.
DOCS: fix INC function in the example for #call
FEAT: added value? native.
Merge pull request #950 from qtxie/value-native

FEAT: added value? native.
Merge pull request #948 from qtxie/fix-doc

DOCS: fix INC function in the example for #call
FEAT: added history support to OS X console