Added user site bin for julia-py

[krystophny]

Since I'm using setup.py develop --user in my setup, julia-py binary is installed in ~/.local/bin. Rather than hardcoding the path to be at the same place as the python binary, one should look also there. This patch adds this behavior. Do you think one could also use site.PREFIXES to replace the default binary path? In that case I will create another patch.

[coveralls]

Pull Request Test Coverage Report for Build 792

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 85.007%

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Totals
Change from base Build 790:	0.02%
Covered Lines:	1701
Relevant Lines:	2001

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💛 - Coveralls