Pip install fix

[Chilipp]

• [x] Closes https://github.com/Chilipp/straditize/issues/1, https://github.com/Chilipp/straditize/issues/8
• [x] Tests passed (for all non-documentation changes)

[codecov[bot]]

Codecov Report

Merging #6 into master will increase coverage by 2.06%. The diff coverage is 87.77%.

@@            Coverage Diff             @@
##           master       #6      +/-   ##
==========================================
+ Coverage   86.11%   88.17%   +2.06%     
==========================================
  Files          26       26              
  Lines       11247    11313      +66     
==========================================
+ Hits         9685     9975     +290     
+ Misses       1562     1338     -224

Impacted Files	Coverage Δ
straditize/widgets/colnames.py	88.16% <0%> (+22.33%)	:arrow_up:
straditize/__main__.py	80% <100%> (-2.8%)	:arrow_down:
straditize/colnames.py	91.33% <100%> (+43.38%)	:arrow_up:
straditize/widgets/data.py	91.63% <100%> (ø)	:arrow_up:
straditize/binary.py	88.03% <100%> (+0.12%)	:arrow_up:
straditize/widgets/menu_actions.py	74.45% <50%> (-0.11%)	:arrow_down:
straditize/magnifier.py	93.06% <76.47%> (+1.4%)	:arrow_up:
straditize/widgets/tutorial/beginner.py	94.09% <87.5%> (+0.03%)	:arrow_up:
straditize/straditizer.py	89% <92.59%> (-0.8%)	:arrow_down:
... and 5 more

---

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[Chilipp]

This PR is ready to be merged. It addresses https://github.com/Chilipp/straditize/issues/1 and https://github.com/Chilipp/straditize/issues/8. In particular:

• it adds pyqt5 to the dependencies in setup.py (see https://github.com/Chilipp/straditize/issues/1)
• it adds tests for the installation with pip in .travis.yml (see https://github.com/Chilipp/straditize/pull/6/commits/a561cba26320a66c8e103ee42c31ad5ea5ce5dab and https://github.com/Chilipp/straditize/pull/6/commits/892faba99e737e9392bdca8694bb757cc6e014a2)
• it changed the installation instructions for the installation from source (see the docs and README and the installation with conda
• it resolves several memory leaks in the test suite (although there are still some) and improves the instructions on running the tests (see the docs)

It will be merged if @sgrieve and @ixjlyons are okay with the proposed changes (see https://github.com/Chilipp/straditize/issues/1#issuecomment-462475855 and https://github.com/Chilipp/straditize/issues/8#issuecomment-462484135).

[Chilipp]

Thanks a lot for your quick response and your time! The suggested changes have been implemented. I will merge this PR now.