Added electron package scripts.

electron-build-linux.sh

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+echo "Build script for Iguana application for Linux platform."
+echo "Preparing electron package $VERSION" && \
+electron-packager . --platform=linux --arch=x64 \
+  --icon=assets/icons/iguana_app_icon_png/128x128.png \
+  --out=build/ --buildVersion=$VERSION \
+  --ignore=assets/bin/win64 --ignore=assets/bin/osx --overwrite || \
+echo "Did you call script with VERSION variable?"

electron-build-osx.sh

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+echo "Build script for Iguana application for MacOS platform."
+echo "Preparing electron package $VERSION" && \
+electron-packager . --platform=darwin --arch=x64 \
+  --icon=assets/icons/iguana_app_icon.icns \
+  --out=build/ --buildVersion=VERSION_NUMBER_HERE \
+  --ignore=assets/bin/win64 --ignore=assets/bin/linux64 --overwrite || \
+echo "Did you call script with VERSION variable?"

electron-build-win.sh

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+echo "Build script for Iguana application for Windows platform."
+echo "Preparing electron package $VERSION" && \
+electron-packager . --platform=win32 --arch=all 
+  --icon=assets/icons/iguana_app_icon.ico 
+  --out=build/ --buildVersion=VERSION_NUMBER_HERE 
+  --ignore=assets/bin/osx --ignore=assets/bin/linux64 --overwrite || \
+echo "Did you call script with VERSION variable?"