Fix sys.path.insert for project path: insert absolute path

[blueyed]

Fixes #637

[codecov-io]

Codecov Report

Merging #638 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #638      +/-   ##
==========================================
+ Coverage   92.68%   92.71%   +0.02%     
==========================================
  Files          33       33              
  Lines        1805     1812       +7     
  Branches      154      154              
==========================================
+ Hits         1673     1680       +7     
  Misses         94       94              
  Partials       38       38

Flag	Coverage Δ
#dj110	84.82% <100%> (+0.05%)	⬆️
#dj111	87.25% <100%> (+0.04%)	⬆️
#dj18	85.81% <100%> (+0.05%)	⬆️
#dj19	84.6% <100%> (+0.05%)	⬆️
#dj20	85.09% <100%> (+0.05%)	⬆️
#dj21	81.07% <100%> (+0.07%)	⬆️
#mysql_innodb	85.2% <100%> (-0.06%)	⬇️
#mysql_myisam	85.15% <100%> (+0.05%)	⬆️
#postgres	88.52% <100%> (+0.04%)	⬆️
#py27	90.23% <100%> (+0.03%)	⬆️
#py34	84.6% <100%> (+0.05%)	⬆️
#py35	84.82% <100%> (+0.05%)	⬆️
#py36	85.65% <100%> (+0.05%)	⬆️
#py37	81.07% <100%> (+0.07%)	⬆️
#sqlite	86.81% <100%> (+0.05%)	⬆️
#sqlite_file	84.6% <100%> (+0.05%)	⬆️

Impacted Files	Coverage Δ
pytest_django/plugin.py	86.47% <100%> (ø)	⬆️
tests/test_manage_py_scan.py	100% <100%> (ø)	⬆️

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