Create installer-config.txt

Primary set of defaults for rbelec.
Update installer-config.txt

added extra packages
new packages and command line

- Added required packages
- Set-up cmdline
repair packages definition

Should be in quotes and no spaces
Merge pull request #19 from Mausy5043/rbelec-master

sync with master
Update installer-config.txt

removed commented lines for cdebootstrap and online-config
Merge pull request #20 from Mausy5043/rbelec-issue#15

PR by @mausy5043 for #15