Merge pull request #5 from digitarald/feature-withstyle

Information page extended and restyled (incl. usage tips, addressing issue #2)
Merge remote-tracking branch 'origin/master'
launch improvements: immediately launch installed apps; launch with JS console; kill previous process when relaunching
add links to builds
fix mac link
add cool graphic as icon and watermark
add menuitem to open content page in tab
put helper item before install page item
activate an existing helper tab in lieu of opening a new one
make helper page title more inclusive now that it isn't only displayed on firstrun
ignore downloaded Mac executables
update gaia submodule
allow you to specify platform of B2G Desktop build to download
mozdownload uses 'extension' now for specifying a file extension
version 0.2
ignore ZIPs and XPIs
Refactored install function out to add more ways of installing manifests
switch back to nsIProcess on Linux, as subprocess isn't working there for some reason
transparentize icon backgrounds
ignore platform-specific directory containing Linux binary; reorganized ignored files