Update readme.md
Update readme.md

In order to account that since 30 Nov 2015 Lean executable is QuantConnect.Lean.Launcher.exe, the path and executable name were changed.
Spinup instructions for Linux were updated to include the installation
of additional dependencies and programs, warn him about an issue with VB
(and how it can be fixed) and ask him to restore NuGet packages before
compilation.

Closes #288

redmeros/Lean,bizcad/Lean,Phoenix1271/Lean,bizcad/Lean,FrancisGauthier/Lean,FrancisGauthier/Lean,Jay-Jay-D/LeanSTP,AnshulYADAV007/Lean,Jay-Jay-D/LeanSTP,FrancisGauthier/Lean,AnObfuscator/Lean,AlexCatarino/Lean,squideyes/Lean,devalkeralia/Lean,QuantConnect/Lean,young-zhang/Lean,tomhunter-gh/Lean,andrewhart098/Lean,tomhunter-gh/Lean,Mendelone/forex_trading,FrancisGauthier/Lean,AnshulYADAV007/Lean,kaffeebrauer/Lean,AnshulYADAV007/Lean,kaffeebrauer/Lean,Mendelone/forex_trading,AnshulYADAV007/Lean,young-zhang/Lean,devalkeralia/Lean,Mendelone/forex_trading,AnObfuscator/Lean,squideyes/Lean,Mendelone/forex_trading,redmeros/Lean,AlexCatarino/Lean,andrewhart098/Lean,AnObfuscator/Lean,jameschch/Lean,jameschch/Lean,AnshulYADAV007/Lean,StefanoRaggi/Lean,bizcad/Lean,StefanoRaggi/Lean,Jay-Jay-D/LeanSTP,tomhunter-gh/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,Phoenix1271/Lean,jameschch/Lean,jameschch/Lean,tomhunter-gh/Lean,young-zhang/Lean,andrewhart098/Lean,andrewhart098/Lean,QuantConnect/Lean,QuantConnect/Lean,devalkeralia/Lean,AlexCatarino/Lean,squideyes/Lean,JKarathiya/Lean,StefanoRaggi/Lean,Jay-Jay-D/LeanSTP,jameschch/Lean,AlexCatarino/Lean,Phoenix1271/Lean,devalkeralia/Lean,mabeale/Lean,redmeros/Lean,Phoenix1271/Lean,Jay-Jay-D/LeanSTP,young-zhang/Lean,mabeale/Lean,kaffeebrauer/Lean,redmeros/Lean,QuantConnect/Lean,AnObfuscator/Lean,JKarathiya/Lean,mabeale/Lean,JKarathiya/Lean,bizcad/Lean,squideyes/Lean,JKarathiya/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,mabeale/Lean