bug(md-spinner): possible memory leak with AoT

[ivoviz]

When using md-spinner with ngc and rollup its OnDestroy method won't run.

Simple plunker example.

The only modification made to md-progress-circle component was to add logging when OnDestroy is called. Obviously it should log destroyed twice, but it happens only once and the interdeterminateInterval keeps running in the background causing memory leak and more cpu usage.

Note that <md-progress-circle mode="indeterminate"> works and its OnDestroy method gets called, so as a workaround it's there. Also, md-spinner itself seems to work as well when not precompiled. I haven't really investigated further so I'm not sure whether it's ngc or rollup causing the issue.

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