Allow using quotes around include

[wallyqs]

Improves the compatibility with JSON by allowing to use "include" directive within quotes.

• Documentation added (if applicable)
• Tests added
• Branch rebased on top of current master (git pull --rebase origin master)
• Changes squashed to a single commit (described here)
• Build is green in Travis CI
• You have certified that the contribution is your original work and that you license the work to the project under the Apache 2 license

Fixes #801

/cc @nats-io/core

Signed-off-by: Waldemar Quevedo wally@synadia.com

[derekcollison]

LGTM, but might be good to start doing very small sample files ephemerally instead of adding the to the repo.

[wallyqs]

@derekcollison I like that idea, ok will change into using a temp folder for the include examples to avoid more files to the repo.

[derekcollison]

Thanks.

[coveralls]

Coverage decreased (-0.1%) to 91.605% when pulling 441d865 on wallyqs:include-parsing-fixes into a4741c5 on nats-io:master.

[wallyqs]

Updated to use a temp folder instead for the includes.

[derekcollison]

LGTM, thanks!