[travis] Remove system_site_packages
System site packages only works for Python 2.7 and 3.2, so remove for 3.3 and 3.4. Also install liblapack because it seems like cvxopt does not find atlas.
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System site packages only works for Python 2.7 and 3.2, so remove for 3.3 and 3.4. Also install liblapack because it seems like cvxopt does not find atlas.