Merge branch 'hotfix-api-request-with-body' into develop
removing useless file
Partial progress towards not requiring a context
Add an S3 print method for prettier console output

This commit illustrates how the return list used for api calls
can be assigned a simple S3 class `github`, such that S3 methods
(any function ending in `.github`) can be added for this class.

I illustrate this with a print method which formats the output
of an API return call in a slightly nicer way. Note that my
output function introduces a dependency on the `yaml` package,
available on CRAN.
add S3methods.R to collate list in Description
github APIs don't require passing the context aroujnd
temporarily revert class setting until we remove yaml from requirements
Merge branch 'hotfix-ignore-badgithub-withbody' into develop
merge
revert yaml dependency
code review, thanks to Urbanek. ctx is now last parameter in every call, defaults to get.github.context. THIS CHANGES THE API
update test
remove utils.R
testing continuous integration via craigcitro/r-travis
travis shield
tweak .travis.yml
change names to not clash with S3 methods in the standard library
more fixes for CRAN warnings
add testthat dependency
update documentation