Install IPython and pyjulia in deps/build.jl

[tkf]

I'm not sure if it is the right thing to do. Installing IPython via Conda.jl is fine but pyjulia has to be installed via pip which may break the conda environment that is used by Conda.jl.

See #4

[codecov-io]

Codecov Report

Merging #6 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   72.94%   72.94%           
=======================================
  Files           4        4           
  Lines          85       85           
=======================================
  Hits           62       62           
  Misses         23       23

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[coveralls]

Pull Request Test Coverage Report for Build 44

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.941%

---

Totals
Change from base Build 43:	0.0%
Covered Lines:	62
Relevant Lines:	85

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 44

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.941%

---

Totals
Change from base Build 43:	0.0%
Covered Lines:	62
Relevant Lines:	85

---

💛 - Coveralls