Expand `Gender` support and unify analysis functions

[samimak37]

This PR changes analysis functions in order to use the new Gender and PronounSeries classes in order to un-binarize the analysis functions, along with tackling some other alpha milestones along the way.

• resolves #102 by utilizing the new Gender and PronounSeries classes, and allows for a wider variety of user input
• resolves #116 by allowing users to perform analysis functions on documents and corpora
• resolves #119 by allowing users to specify word windows that they would like to search within for find_gender_adj

[codecov-io]

Codecov Report

Merging #143 (e066252) into master (9bafdee) will increase coverage by 5.11%. The diff coverage is 40.83%.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
+ Coverage   51.16%   56.28%   +5.11%     
==========================================
  Files          12       12              
  Lines        1675     1464     -211     
  Branches      364      361       -3     
==========================================
- Hits          857      824      -33     
+ Misses        757      586     -171     
+ Partials       61       54       -7     

Impacted Files	Coverage Δ
gender_analysis/analysis/dunning.py	30.00% <0.00%> (ø)
gender_analysis/analysis/dependency_parsing.py	12.14% <6.25%> (-1.57%)	:arrow_down:
gender_analysis/analysis/instance_distance.py	32.60% <8.69%> (-1.98%)	:arrow_down:
gender_analysis/analysis/gender_adjective.py	45.27% <44.89%> (+14.89%)	:arrow_up:
gender_analysis/analysis/gender_frequency.py	59.33% <57.46%> (+9.69%)	:arrow_up:
gender_analysis/gender.py	100.00% <0.00%> (+2.63%)	:arrow_up:

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[ryaanahmed]

HUGE WORK all! Everything looks solid to me. I'm going to go ahead and merge.