Tapping multiple bar button items

[immenor]

I took a first pass at adding the ability to tap multiple bar button items in the navigation bar. I also added the ability to tap them based on either the title or the system item. In my case I had two icons in the rightBarButtonItems I needed to tap.

Im not sure if there are rules I should be aware of with the comments above the public functions. I tried to follow the style you had for the tapBarButtonItem(systemItem:) function. Let me know how this works.

[codecov-io]

Codecov Report

Merging #42 into master will increase coverage by <.01%. The diff coverage is 98.62%.

@@            Coverage Diff            @@
##           master     #42      +/-   ##
=========================================
+ Coverage   97.39%   97.4%   +<.01%     
=========================================
  Files         126     126              
  Lines        5879    5966      +87     
=========================================
+ Hits         5726    5811      +85     
- Misses        153     155       +2

Impacted Files	Coverage Δ
...wController/UIViewController+UIBarButtonItem.swift	100% <100%> (ø)	:arrow_up:
...rastructure/Builders/UIViewControllerBuilder.swift	100% <100%> (ø)	:arrow_up:
...troller/UIViewController+UIBarButtonItemSpec.swift	99.13% <98.19%> (-0.87%)	:arrow_down:

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[theextremeprogrammer]

Thanks for this PR @immenor! From a quick glance everything looked good - I may tweak a couple of things and then follow up with you afterwards. Thanks again!! 👍

[theextremeprogrammer]

@immenor please take a look at commit 526dd972ca9e7ab1e2a0a5e9e138a4fc6506a00d to see updates made related to this PR and let me know if you want to chat about any of these. 👍 Thanks for bringing this functionality into Succinct!

[theextremeprogrammer]

Closes #41