Added boost for matches directly following the last period

[scohen]

If something matches starting after the last period (of a likely module) it is boosted. This makes a match for MyModule.Structs.User take precedence over MyModule.User.Something while querying for User

[scottming]

I think this PR solves this problem:

This makes a match for MyModule.Structs.User take precedence over MyModule.User.Something while querying for User

but it doesn't address the issue with mixed case. Instead, it pushes modules with capital letters further down. The screenshot illustrates the problem; the module with 'User' at the top is sorted towards the end.

You can also reproduce the issue with this unit test:

    test "matches when there're mixed case characters" do
      results = score_and_sort(~w(create_user save_user Demo.Accounts.User), "User")
      assert results == ~w(Demo.Accounts.User create_user save_user)
    end

[scohen]

@scottming i made some changes to the scoring that should improve the situations you've mentioned.

[scottming]

I tested it and I think the latest version works really well, thank you. I believe that boosting the last module is extremely effective because once we pinpoint the module, we can narrow the scope and more quickly locate the specific symbol.