Added 'print' chunk option

[mossr]

The print chuck option is useful in the juliaconsole environment so we can use print instead of display (certain vectors output more compactly using print, especially for textbooks). I think a more sophisticated implementation (e.g., use of Base.invokelatest) could be an improvement from my first pass.

Note, this was forked off of v0.9.4

[codecov-commenter]

Codecov Report

Merging #387 into master will decrease coverage by 0.03%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #387      +/-   ##
==========================================
- Coverage   74.34%   74.31%   -0.04%     
==========================================
  Files          25       25              
  Lines        1345     1347       +2     
==========================================
+ Hits         1000     1001       +1     
- Misses        345      346       +1     

Flag	Coverage Δ
#unittests	74.31% <66.66%> (-0.04%)	:arrow_down:

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Impacted Files	Coverage Δ
src/config.jl	20.00% <ø> (ø)
src/display_methods.jl	41.93% <66.66%> (+0.26%)	:arrow_up:

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