[WIP] Small fixes and improvements for publication-quality plotting

[asinghvi17]

This is just a collection of small fixes which I needed. I'll add to it as I produce more plots.

Fixes #53

[codecov-io]

Codecov Report

Merging #54 into master will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #54   +/-   ##
=======================================
  Coverage   61.12%   61.12%           
=======================================
  Files          22       22           
  Lines        1546     1546           
=======================================
  Hits          945      945           
  Misses        601      601           

Impacted Files	Coverage Δ
src/types.jl	78.57% <ø> (ø)
src/lobjects/llegend.jl	64.86% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update b5dfdea...290ec7d. Read the comment docs.