Adding grammar for precondition a attributes

[hyavari]

Hi, I've just added the required grammar for parsing precondition a attributes based on RFC 3312.

Sample:

v=0
.....
a=curr:qos local none
a=curr:qos remote none
a=des:qos mandatory local sendrecv
a=des:qos none remote sendrecv
a=sendrecv
.....

[clux]

This seems to be the part of the thing that you are actually adding. From a quick scan, looks sensible.
Are you able to add some tests for it?

[hyavari]

Hi, I tried but not sure why tests are not runnable. I'll spend more time.

[hyavari]

I added parse and write tests for precondition added grammar.

[clux]

Thanks for this. This looks great to me.

Now for the awkward part. It's actually been a while since I've had to do a release on this, and travis has shutdown since :|
Will need to spend some time to fixup CI now.

[hyavari]

Hi Eirik,
I've just added the MRCP attributes support as well (grammar + test).

[clux]

Hey, i've updated testing setup now, if you're able to update (nm, i can do it from here) - and it's all green - i can try to push this out later :-)