[sympy] Make sure Sphinx extensions are put in the front of the PATH (#1694)

[Aaron Meurer]

This hopefully fixes the issue noted here. @moorepants, can you verify that the docs build for you in this branch?

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You can merge this Pull Request by running:

  git pull https://github.com/asmeurer/sympy sphinx_extensions

Or view, comment on, or merge it at:

  https://github.com/sympy/sympy/pull/1694

Commit Summary

• Make sure Sphinx extensions are put in the front of the PATH

File Changes

• M doc/src/conf.py (2)

Patch Links

• https://github.com/sympy/sympy/pull/1694.patch
• https://github.com/sympy/sympy/pull/1694.diff

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[Aaron Meurer]

SymPy Bot Summary: Passed after merging asmeurer/sphinx_extensions (96d4b7f) into master (501534b).
**Sphinx 1.1.3:** pass

[Julien Rioux]

SymPy Bot Summary: Passed after merging asmeurer/sphinx_extensions (96d4b7f) into master (501534b).

Sphinx 1.1.3: pass
Docs build command: make html-errors && make latex && cd _build/latex && xelatex sympy-*.tex

[Aaron Meurer]

SymPy Bot Summary: Failed after merging asmeurer/sphinx_extensions (96d4b7f) into master (501534b).
@asmeurer: Please fix the test failures.
Python 2.5.0-final-0: pass
Python 2.6.6-final-0: pass
Python 2.7.2-final-0: pass
Python 2.6.8-final-0: pass
Python 2.7.3-final-0: fail
PyPy 2.0.0-beta-1; 2.7.3-final-42: pass
Python 3.2.2-final-0: pass
Python 3.3.0-final-0: pass
Python 3.2.3-final-0: pass
Python 3.3.0-final-0: pass
Python 3.3.0-final-0: pass

**Sphinx 1.1.3:** pass

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[Julien Rioux]

Merged #1694.