Merge pull request #7 from cwandrews/master

fixed the TARGET OS to be darwin
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removed include of clasp_gmpxx.h from numbers.cc profile.cc str.cc and strWithFillPtr.cc
merged
added --ignore-site-config to BJAM so that it is always used everytime bjam is invoked
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cleaned up makefile
added CXXFLAGS as an environment variable to control build"
merge
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