Release 1.1.6.1.

* In jsonld executable, let API open input files, allowing documentLoader to be used.
* Use toRdf instead of reader interface in jsonld executable, so that a context found by Link header will be applied.
Guard against server not returning a Content-Type (test-suite server, apparently).
This addresses issue #14.
Be more careful in using provided_context as serialized context.
This addresses issue #15
Version 1.1.7.
Move linkeddata and equivalent-xml dependencies to :debug environment in Gemfile; not needed for Travis-CI.
Release 1.1.7

* Guard against server not returning a Content-Type (test-suite server, apparently).
* Be more careful in using provided_context as serialized context.
* Move linkeddata and equivalent-xml dependencies to :debug environment in Gemfile; not needed for Travis-CI.
* Releases fixes for issues #14 and #15