[express] Instrumentation
[express] Inject RUM header/footer into express render locals
[express] Support 3.x back to 3.2.0
[rum] Attempt to get accessKey from environment or tracelyzer configs to generate rumId from
[rum] Fix the rumId generation
[express] Cleanup and fix issue with route profile not encapsulating inner stacks correctly
[express] Further cleanup and added express layer to encapsulate the profiles
[express] Render makes more sense as a layer, since it could end up nested in non-express layers
[express] Update tests to reflect recent changes
[express] Change express profile name to use 'url-pattern function-name' format
Merge pull request #16 from appneta/express-controller-info

[express] Instrumentation