Dropping support and updating docs

[KatherineMichel]

• Standardize documentation layout
• Drop Django v1.8, v1.10 support

[codecov[bot]]

Codecov Report

Merging #45 into master will decrease coverage by 0.02%. The diff coverage is 87.5%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
- Coverage   93.11%   93.09%   -0.03%     
==========================================
  Files          14       13       -1     
  Lines         276      275       -1     
  Branches       15       15              
==========================================
- Hits          257      256       -1     
  Misses         13       13              
  Partials        6        6

Flag	Coverage Δ
#py27dj110	?
#py27dj111	93.09% <87.5%> (-0.03%)	:arrow_down:
#py34dj110	?
#py34dj111	93.09% <87.5%> (-0.03%)	:arrow_down:
#py34dj18	?
#py34dj20	93.09% <87.5%> (-0.03%)	:arrow_down:
#py35dj110	?
#py35dj111	93.09% <87.5%> (-0.03%)	:arrow_down:
#py35dj18	?
#py35dj20	93.09% <87.5%> (-0.03%)	:arrow_down:
#py36dj111	93.09% <87.5%> (-0.03%)	:arrow_down:
#py36dj20	93.09% <87.5%> (-0.03%)	:arrow_down:

Impacted Files	Coverage Δ
pinax/messages/migrations/0001_initial.py	100% <ø> (ø)	:arrow_up:
pinax/messages/context_processors.py	85.71% <0%> (ø)	:arrow_up:
pinax/messages/views.py	89.47% <100%> (ø)	:arrow_up:
pinax/messages/models.py	96.66% <100%> (ø)	:arrow_up:
pinax/messages/urls.py	100% <100%> (ø)	:arrow_up:
pinax/messages/templatetags/__init__.py

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