[BEAM-117] Minor updates for DisplayData usage#241

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swegner wants to merge 3 commits intoapache:masterfrom

swegner:displaydata-tweaks

Commits on Apr 26, 2016

Rename DisplayDataMatchers.includes to includesDisplayData to clarify usage
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Normalize comments to refer to 'display data' rather than 'display metadata'
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Add super.populateDisplayData() to standard implementations. The current super implementation is a no-op, but this is the recommended way to implement the pattern
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