doc for incremental builds

[bparees]

need to document/provide sample of how to configure incremental builds for STI strategy.

@soltysh @danmcp fyi.

[soltysh]

@bparees you're again trying to steal my work :-P
On May 30, 2015 3:29 AM, "Ben Parees" notifications@github.com wrote:

@CowboysFan https://github.com/CowboysFan if you have permission,
please assign this to me. thanks.

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#424 (comment)
.

[bparees]

All yours.

[soltysh]

@bparees please close since #465 got merged.

[bparees]

thanks @soltysh !