Remove all pre-0.7 code

[tk3369]

No description provided.

[codecov]

Codecov Report

Merging #61 into master will increase coverage by 0.71%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
+ Coverage   92.42%   93.14%   +0.71%     
==========================================
  Files           8        8              
  Lines         779      773       -6     
==========================================
  Hits          720      720              
+ Misses         59       53       -6

Impacted Files	Coverage Δ
src/ResultSet.jl	97.43% <100%> (+6.95%)	⬆️
src/CIDict.jl	96.29% <100%> (+9.62%)	⬆️

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[coveralls]

Coverage increased (+0.8%) to 93.086% when pulling 3b15cac on remove-pre-0.7-if-branches into 82210ef on master.