Fixed iOs version of TestApp.
* Removed Pair and Trio (use Tuple instead).
* Made DefinitionFile a content type.
Cleaning up
cleaning up
UiButton
Styles
Styles - sample
* UiBorder children placement implementation.
* ClipChildren for UiContainer(s)
* Added '@' beginning for Length type.
Added 'C' option (Center) to Length. Now length is made from two parts: Mode +/- Value (px/percent)

where Mode can be:
{Empty} - 0
C - half of size
@ - whole size

and Value can be:
00  - pixels
00% - percents

Sample uses:
C+50 - Center plus 50 pixels
C-25% - Center minus 25% of size.
@-9 - Size minus 9 pixels.
29 - 29 pixels.
Fixes in delegate calling.
Method invoking fixes - ambiguous exception removed. Method is found by its name and number of parameters.
Sample
Some Fixes,
UiView delegates,
iOs testApp fixes
Music controller common
* Stack Panel
* Rectangle
* Advanced Length computing
Fix for NinePatchImage loading while no GraphicsDevice.
* NinePatchImage sample
Other fixes
Fixed Download program.
Units instead of pixels.
Unit fixes.
Merge pull request #9 from ebatiano/master

Multiple imporvements