Bump version to 10.4.2.1

Author: johnhaddon

Changes

@@ -1,4 +1,4 @@
-10.4.x.x (relative to 10.4.2.0)
+10.4.2.1 (relative to 10.4.2.0)
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 Build

SConstruct

@@ -57,7 +57,7 @@ SConsignFile()
 ieCoreMilestoneVersion = 10 # for announcing major milestones - may contain all of the below
 ieCoreMajorVersion = 4 # backwards-incompatible changes
 ieCoreMinorVersion = 2 # new backwards-compatible features
-ieCorePatchVersion = 0 # bug fixes
+ieCorePatchVersion = 1 # bug fixes
 ieCoreVersionSuffix = "" # used for alpha/beta releases. Example: "a1", "b2", etc.
 
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