Add style tests for Gumbo components

Add tests to all Gumbo components for text and other styles

Some have style tests excluded at the ant level; Others need style tests added
See FxCheckBox textStyles tests for list of styles to test

Also: https://zerowing.corp.adobe.com/display/flex/Spark+Styles+Testing

In testing these styles, you should test them in:
1) Setting in mxml
2) Changing styles at runtime
3) Spot test for setting the style in css

Styles that should be tested for all components, and require Evtim's Advanced Constraints :
top
bottom
verticalCenter
left
right
horizontalCenter,
baseline

*Wait to test these until Evtim finishes his advanced constraints work for Gumbo layout.

Styles that should be tested for all components that use text:
color
direction
fontFamily
fontSize
fontWeight
kerning
lineThrough
paddingBottom/Top/Right/Left
selectionColor
textAlign
textDecoration
textIndent
verticalAlign

Styles that should be tested with multi-line text components (CheckBox, Button, TextArea, etc):
blockProgression
justificationStyle
lineBreak
lineHeight

Styles not tested on all components:
alignmentBaseline
baselineShift
breakOpportunity
cffHinting
columnCount (should be tested for TextArea)
columnGap (should be tested for TextArea)
columnWidth (should be tested for TextArea)
digitCase
digitWidth
dominantBaseline
errorColor (should be tested for TextInput)
firstBaselineOffset
firstBaselineOffsetBasis
focusBlendMode
focusSkin
focusThickness
fontLookup
inactiveSelectionColor
justificationRule
leadingBasis
leadingDirection
ligatureLevel
locale
marginLeft/Right/Top/Bottom
renderingMode
skinClass
tabStops
textAlignLast
textAlpha
themeColor
tracking
trackingLeft
trackingRight
typograhicCase
unfocusedSelectionColor
whiteSpaceCollapse