Add weasyprint pdf generation

[adinhodovic]

• Add some styling changes
• Remove django22 from Tox and use django30.
• Remove python36 from Tox
• Add stylelintrc

[codecov]

Codecov Report

Merging #21 into master will not change coverage by %.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #21   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         3    +1     
  Lines           34        53   +19     
  Branches         0         1    +1     
=========================================
+ Hits            34        53   +19     

Flag	Coverage Δ
#unittests	100.00% <100.00%> (ø)

Impacted Files	Coverage Δ
wagtail_resume/views.py	100.00% <100.00%> (ø)
...gtail_resume/templatetags/wagtail_resume_extras.py	100.00% <0.00%> (ø)

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