Support * wild card in TargetElement Attribute.

[NTaylorMullen]

This will enable TagHelper authors to target IEnumerable<KeyValuePair> attributes (#89).

Essentially:

[TargetElement(Attributes = "q-*")]
public class QueryParamTagHelper : TagHelper { }

Use:

<!-- A TagHelper because of q-custom -->
<a href="~/home/index" q-custom="AValue">Go to index</a> 

[danroth27]

@DamianEdwards How important is this? Do we want this for beta5?

[DamianEdwards]

Yes, it's needed for the anchor Tag Helper when we finish the work to support binding to dictionary properties.