updated version to 9.0.0-a2

Author: davidsminor

SConstruct

@@ -53,7 +53,7 @@ SConsignFile()
 ieCoreMajorVersion=9
 ieCoreMinorVersion=0
 ieCorePatchVersion=0
-ieCoreVersionSuffix="a1"	# used for alpha/beta releases. Example: "a1", "b2", etc.
+ieCoreVersionSuffix="a2"	# used for alpha/beta releases. Example: "a1", "b2", etc.
 
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 # Command line options