SSML: Support for variable timed breaks (mid-sentence pauses)

[earboxer]

There is no way to manually specify a longer pause in SSML.

Hello -- friend.
Hello, friend.
Hello. friend.
Hello -- -- friend.
Hello <break/> friend.
Hello <break/><break/><break/> friend.
Hello <break size='1000'/> friend.
Hello <break time='1s'/> friend.

all pause for the same amount of time.

Mimic appears to be able to handle a "size" attribute on SSML <break> tags, but it doesn't seem to work.

It would be nice to support the time attribute as defined by the SSML spec