Release Candidate 2.6.0.x

In this release:

* README Fixes/improvements per @danriti in #35 
* Reading access key from tracelytics config file. per @felipecvo in #33 
* Net::ReadTimeout doesn't report HTTP information per @eronarn in #32 
* Fix "[oboe/error] .. undefined method `[]' for nil:NilClass" per @felipecvo in #29 & #30
* Automated Sinatra/Padrino tracing #23