updated linux install instructions and added linux common troubleshooting problems section
updated linux install instructions and added linux common troubleshooting problems section

stevenewey/yotta,eyeye/yotta,ARMmbed/yotta,BlackstoneEngineering/yotta,ARMmbed/yotta,autopulated/yotta,stevenewey/yotta,BlackstoneEngineering/yotta,eyeye/yotta,autopulated/yotta