BLD: Modified mocksip to allow for building the docs without qt being
installed
STY: pep8 fixes
Instantiate Sip Mock before use
Merge pull request #1 from jenshnielsen/mocksip_for_docbuild_without_qt_fix

Instantiate Sip Mock before use
Merge pull request #3799 from cimarronm/mocksip_for_docbuild_without_qt

Update to doc/conf.py to allow for building docs without qt installed