Use $USER value from shell environment, instead of uid.

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>
Fixed issue with Linux support with /home

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>
Added Linux support in bin/ignitersinstall

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>
Added more features info and example - with howto. Updated gitignore

Signed-off-by: Daniel (dmilith) Dettlaff <dmilith@verknowsys.com>