README: Use 'source' instead of '.'

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
default.xml: Change meta-oe to 'dora' branch

Change-Id: I7b10fa5d1e8fe5f0b741faaf8a8f1dff0c2358bb
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>