Fix multi level match any routes

[lammel]

This is a pull request for issue #1412 which probably also fixes #1406 .

The benchmarks also indicate a slight improvement for the route tests (although that was not intential). So this should probably be verified elsewhere too.

As a side-effect also a small issue for the router not returning the correct remaining path in c.Param("*") with overlapping any routes has been fixed (and a test added)

The route tests have also been improved which can also be provided as part of this PR are separately.

[codecov]

Codecov Report

Merging #1413 into master will increase coverage by 0.27%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1413      +/-   ##
==========================================
+ Coverage   84.09%   84.36%   +0.27%     
==========================================
  Files          27       27              
  Lines        2068     2079      +11     
==========================================
+ Hits         1739     1754      +15     
+ Misses        214      212       -2     
+ Partials      115      113       -2

Impacted Files	Coverage Δ
router.go	96.3% <100%> (+1.69%)	⬆️

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[lammel]

The travis CI error is not related to this PR is seems.
No changes to the modules (go.mod) have been done, so that seems to be unrelated.

The command "go get -v golang.org/x/lint/golint" failed and exited with 1 during 

Let me know if a should push again.

[lammel]

Rebased on master (v4.1.11) now.

An additional issue has been fixed in route insert, which did not correctly update the parent node on node split (which resolves an issue with adding routes in the wrong order, causing a root-node split, tests added for that case).

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[asahasrabuddhe]

Please re-open this. We need this merged.

[asahasrabuddhe]

Thank you very much!