new mac osx icon (including SVG Version)

- added new created and documented svg version of shaded icon
- changed "B" background to white (no longer transparent)
- removed PSD (Adobe Photoshop) document
- license is now MIT

Signed-off-by: Jonas Schnelli <jonas.schnelli@include7.ch>

doc/assets-attribution.txt

@@ -56,6 +56,6 @@ Designer: Vignoni David
 Site: http://www.oxygen-icons.org/
 License: Oxygen icon theme is dual licensed. You may copy it under the Creative Common Attribution-ShareAlike 3.0 License or the GNU Library General Public License.
 
-Icon: src/qt/res/icons/bitcoin.icns, src/qt/res/icons/bitcoin.psd
-Designer: Jonas Schnelli
-License: Public domain
+Icon: src/qt/res/icons/bitcoin.icns, src/qt/res/icons/bitcoin.psd, src/qt/res/icons/bitcoin.svg
+Designer: Jonas Schnelli (original bitcoin logo from Bitboy)
+License: MIT

src/qt/res/icons/bitcoin.svg

@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!-- Designer: Jonas Schnelli
+  	 License: MIT
+-->
+
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1"
+	 id="svg2" sodipodi:docname="bitcoin-logo-noshadow.svg" inkscape:version="0.48.2 r9819" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:svg="http://www.w3.org/2000/svg" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="1024px" height="1024px"
+	 viewBox="-34 -34 580 580" enable-background="new 0 0 1024 1024" xml:space="preserve">
+
+	<!-- nice shadow with alpha 0.35 -->
+	<filter id="dropShadowAlpha">
+		<feColorMatrix result="matrixOut" in="SourceAlpha" type="saturate"
+	      values="0.1" />
+		<feGaussianBlur in="matrixOut" result="blur-out" stdDeviation="6" />
+		<feColorMatrix in="blur-out" result="color-out" type="matrix"
+		      values="0 0 0 0   0
+		              0 0 0 0   0 
+		              0 0 0 0   0 
+		              0 0 0 0.35 0"/>
+		<feBlend in="SourceGraphic" in2="color-out" mode="normal" />
+	</filter>
+	
+	<g>
+		<!-- white background circle for making B not transparent but still keep inner shadows -->
+		<circle cx="255" cy="255" r="200" stroke-width="2" fill="white"/>
+	
+		<radialGradient id="innerBtop" cx="277.4905" cy="196.4412" r="34.3969" gradientUnits="userSpaceOnUse">
+			<stop offset="0" style="stop-color:#F9AA4B"/>
+			<stop offset="1" style="stop-color:#F7931A"/>
+		</radialGradient>
+		<path fill="url(#innerBtop)" filter="url(#dropShadowAlpha)" d="M254.647,174.6l-13.983,56.08c15.855,3.951,64.735,20.071,72.656-11.656
+			C321.568,185.928,270.503,178.552,254.647,174.6z"/>
+		
+		<radialGradient id="innerBbottom" cx="261.9153" cy="284.5671" r="39.8381" gradientUnits="userSpaceOnUse">
+			<stop offset="0" style="stop-color:#F9AA4B"/>
+			<stop offset="1" style="stop-color:#F7931A"/>
+		</radialGradient>
+		<path fill="url(#innerBbottom)" filter="url(#dropShadowAlpha)" d="M233.608,258.984l-15.425,61.832c19.04,4.729,77.769,23.584,86.448-11.296
+			C313.703,273.144,252.647,263.736,233.608,258.984z"/>
+				
+		<radialGradient id="coinShape" cx="256.0276" cy="256.0027" r="255.9878" gradientUnits="userSpaceOnUse">
+			<stop offset="0" style="stop-color:#F9AA4B"/>
+			<stop offset="1" style="stop-color:#F7931A"/>
+		</radialGradient>
+		<path fill="url(#coinShape)" filter="url(#dropShadowAlpha)" d="M317.871,7.656c-137.12-34.192-276.024,49.28-310.2,186.44
+			c-34.208,137.136,49.256,276.048,186.36,310.24c137.16,34.199,276.063-49.265,310.256-186.408
+			C538.479,180.776,455.023,41.848,317.871,7.656z M368.807,219.528c-3.688,24.936-17.512,37.008-35.864,41.24
+			c25.2,13.12,38.024,33.239,25.809,68.12c-15.16,43.319-51.176,46.976-99.072,37.912l-11.624,46.584l-28.088-7l11.472-45.96
+			c-7.279-1.809-14.72-3.729-22.384-5.809l-11.512,46.177l-28.056-7l11.624-46.673c-6.561-1.68-13.225-3.464-20.024-5.168
+			l-36.552-9.111l13.943-32.152c0,0,20.696,5.504,20.416,5.096c7.952,1.969,11.48-3.216,12.872-6.672l18.368-73.64l0.048-0.2
+			l13.104-52.568c0.344-5.968-1.712-13.496-13.088-16.336c0.439-0.296-20.4-5.072-20.4-5.072l7.472-30l38.736,9.673l-0.032,0.144
+			c5.824,1.448,11.824,2.824,17.937,4.216L245.423,89.2l28.072,7l-11.28,45.224c7.536,1.721,15.12,3.456,22.504,5.297l11.2-44.929
+			l28.088,7l-11.504,46.145C347.967,167.152,373.904,185.464,368.807,219.528z"/>
+	</g>
+</svg>