initial implementation of 'optimize imports' for Python

python/testData/optimizeImports/importStar.after.py

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+from re import *
+compile

python/testData/optimizeImports/importStar.py

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+from sys import *
+from re import *
+compile

python/testData/optimizeImports/importStarOneOfMultiple.after.py

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+from re import compile
+compile

python/testData/optimizeImports/importStarOneOfMultiple.py

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+from re import compile, search
+compile

python/testData/optimizeImports/oneOfMultiple.after.py

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+import sys
+print sys.argv

python/testData/optimizeImports/oneOfMultiple.py

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+import sys, os
+print sys.argv

python/testData/optimizeImports/simple.py

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+import sys