Export bugs and refined bitmap handling

Check existence of svg files for image file export
Eliminated MAIN icon from notes
Redesigned drawing of bitmaps in test app
Fixed codes in Simple exports
Fixed unit test bugs
Merge branch 'master' of https://github.com/Esri/joint-military-symbology-xml into andyb

Conflicts:
	source/JointMilitarySymbologyLibraryCS/Test/SvgSymbol.cs
Merge branch 'andyb'
Merge pull request #97 from abouffard/master

Export bugs and refined bitmap handling