module/apmrestful: add tracing filter

[axw]

Add a Filter for tracing go-restful requests.
Installing the filter into a container,
webservice, or route, will cause the requests
within that scope to be traced, and panics
recovered and reported.

Closes #227

[codecov-io]

Codecov Report

Merging #270 into master will increase coverage by 0.13%.
The diff coverage is 92.3%.

@@            Coverage Diff             @@
##           master     #270      +/-   ##
==========================================
+ Coverage   81.05%   81.18%   +0.13%     
==========================================
  Files          96       98       +2     
  Lines        5557     5622      +65     
==========================================
+ Hits         4504     4564      +60     
- Misses        834      837       +3     
- Partials      219      221       +2

Impacted Files	Coverage Δ
module/apmrestful/route.go	100% <100%> (ø)
module/apmrestful/filter.go	87.8% <87.8%> (ø)

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