Added pipeline functionality and made minor fixes

[DBremen]

Hi Nicholas,
thanks a lot for the great module. I've made some changes and hope that you might find them useful:
Get-Histogram

• Added DefaultDisplayPropertySet (Index,Count,lowerBound,upperBound)
• Made function take input from pipeline (not processing by pipeline but just as syntactic sugar)
• Replaced arraylist "pipeline data collector" by automatic $Input variable
• Changed gh alias to ghist (collided with Get-Help for me)
• Cannot get the test "Honors minimum and maximum values" working (mock call to write-warning)

Add-Bar

• Fixed double selection of Count property
• Changed name of InputObject to Data for consistency
• Replaced arraylist "pipeline data collector" by automatic $Input variable

Measure-Object

• Made function take input from pipeline (not processing by pipeline but just as syntactic sugar)

Show-Measurement

• Made function take input from pipeline (not processing by pipeline but just as syntactic sugar)
• Changed name of InputObject to Data for consistency
• Could not get the 'Produces output' test working (mock call to write-host)
• Decreased width to account for text in front of graph

Dirk