Added support for passing Range as a parameter to .Exclude.

[tacosontitan]

TL;DR

This PR resolves #10 by adding support for passing Range as a parameter to .Exclude:

var samples = Enumerable.Range(1, 100).Exclude(6..94);
foreach (var sample in samples)
    Console.WriteLine(sample);

The expected output for the above snippet is 1 - 5 followed by 95 - 100 with each value on its own line.

Format Adjustment

The existing ternary expressions for the Count properties did not match what was present in other methods in the file. As the other formats are generally cleaner I updated the Count properties to break nesting out:

var sample = foo.Bar
    ? foo.Bar
    : foo.Bar < 5
        ? foo.Fizz
        : foo.Buzz;

Improved Documentation

Methods with access levels of protected or higher should have some form of documentation, even if their containing models are private, simply for consumer understanding. As such, I added documentation to the Count properties, and specified that documentation should be inherited from IEnumerable<T> where applicable.

##Constructor Visibility

I marked the constructors for the private types as internal since by definition they'll never be consumed outside of the assembly.

[viceroypenguin]

One thing I note in all three implementations is that they assume that !range.Start.IsFromEnd and !range.End.IsFromEnd.

Thankfully, Collection and List patterns are easy, because Index.GetOffset(int length) exists specifically for this purpose. You can filter both range.Start and range.End through this method in the constructor before using them for the rest of the iterator.

For the Core method, it will require some additional evaluation. You can review the Insert for a glimpse at that pattern that will be required to handle it properly.

[tacosontitan]

One thing I note in all three implementations is that they assume that !range.Start.IsFromEnd and !range.End.IsFromEnd.

Still looking into this, just haven't had much time this week yet.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (886ca78) 95.28% compared to head (21a27bb) 95.27%.

Files	Patch %	Lines
Source/SuperLinq/Exclude.cs	97.05%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #619      +/-   ##
==========================================
- Coverage   95.28%   95.27%   -0.01%     
==========================================
  Files         248      248              
  Lines        8648     8701      +53     
  Branches     1592     1609      +17     
==========================================
+ Hits         8240     8290      +50     
- Misses        217      219       +2     
- Partials      191      192       +1     

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[tacosontitan]

I still need to add perf improvements and test coverage.

[tacosontitan]

I will have some time this weekend to work on this assuming I'm not still sick. I appreciate your patience with me and your assistance on it!