Allow use of set with extends tag

[thomas-p-wilson]

Quick but effective. As we discover other tags that can be used in conjunction with the extends tag, we can easily add them by simply modifying the JtwigContentParser accordingly.

[joao-de-melo]

Thomas this one is failing on travis CI.
Could you also explain me this PR?

[coveralls]

Coverage increased (+1.23%) when pulling 7ed388a on thomas-p-wilson:extends-set-tag into c6d84ea on lyncode:master.

[thomas-p-wilson]

Missed this, sorry @lyncodev. Travis is saying the build is good, so I'm not sure what the problem was. This allows the use of the set tag before the extends tag. Previously set could only be used after.

[joao-de-melo]

Needs re-work.

[thomas-p-wilson]

Not surprised. I vaguely recall screwing up something :D I'll have at it
again.

On Mon, Oct 27, 2014 at 5:51 PM, João Melo notifications@github.com wrote:

Needs re-work.

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[joao-de-melo]

@thomas-p-wilson cannot find the source repo here (I was trying to pull the code and merge it).

[thomas-p-wilson]

This matter is now addressed as a result of #257, pending approval of course. And given that I can't find my original branch for this PR, I'm closing this.