Feature Request: support logical indexing

[metanoid]

Would be nice if logical indexing was supported.

# this works
y = [1,2,1,4]
y[y .> 1.0]

# this doesn't
x = ComponentArray(a=1, b=[2, 1, 4])
x[x .> 1.0]

[jonniedie]

This should work now. I was too strict on my indexing types. Thanks for the issue!