support changing plot size (included in PR #186)

[hdavid16]

Fix #94 #147 #161

plot size can be controlled with keyword argument plot_size (added to docstring and README). plot_size is either nothing (default), or a tuple of Measures (width, height)

uses Compose.set_default_graphic_size as suggested by @simonschoelly in #94

Also, plot margins can be controlled with padding kwargs.

[codecov[bot]]

Codecov Report

Merging #182 (68cbd0a) into master (52f4aae) will increase coverage by 0.24%. The diff coverage is 53.19%.

@@            Coverage Diff             @@
##           master     #182      +/-   ##
==========================================
+ Coverage   32.92%   33.16%   +0.24%     
==========================================
  Files           9        8       -1     
  Lines         565      591      +26     
==========================================
+ Hits          186      196      +10     
- Misses        379      395      +16     

Impacted Files	Coverage Δ
src/layout.jl	48.42% <16.66%> (ø)
src/lines.jl	51.87% <50.00%> (-0.36%)	:arrow_down:
src/plot.jl	60.22% <81.81%> (-2.42%)	:arrow_down:
src/GraphPlot.jl

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