Added -FirstDataRow and updated examples

Examples/Nasa/FireBalls.ps1

@@ -10,4 +10,4 @@ $header = echo `
     'Total Radiated Energy (J)' `
     'Calculated Total Impact Energy (kt)'
 
-Import-Html http://neo.jpl.nasa.gov/fireballs/ 5 -Header $header
+Import-Html http://neo.jpl.nasa.gov/fireballs/ 5 -Header $header -FirstDataRow 1

Get-HtmlTable.ps1

@@ -3,7 +3,8 @@ function Get-HtmlTable {
         [Parameter(Mandatory=$true)]
         $url,
         $tableIndex=0,
-        $Header
+        $Header,
+        [int]$FirstDataRow=0
     )
 
     $r = Invoke-WebRequest $url
@@ -11,7 +12,7 @@ function Get-HtmlTable {
     $propertyNames=$Header
     $totalRows=@($table.rows).count
 
-    for ($idx = 1; $idx -lt $totalRows; $idx++) {
+    for ($idx = $FirstDataRow; $idx -lt $totalRows; $idx++) {
 
         $row = $table.rows[$idx]
         $cells = @($row.cells)        

Import-Html.ps1

@@ -4,7 +4,8 @@ function Import-Html {
     param(
         $url,        
         $index,
-        $Header
+        $Header,
+        [int]$FirstDataRow=0
     )
     
     $xlFile = [System.IO.Path]::GetTempFileName() -replace "tmp","xlsx"
@@ -12,7 +13,7 @@ function Import-Html {
 
     Write-Verbose "Exporting to Excel file $($xlFile)"
 
-    $data = Get-HtmlTable -url $url -tableIndex $index -Header $Header
+    $data = Get-HtmlTable -url $url -tableIndex $index -Header $Header -FirstDataRow $FirstDataRow
     
     $data | Export-Excel $xlFile -Show -AutoSize
 }