Merge pull request #8 from eluizbr/devel

Devel
Update funcoes.sh
Update install-pabx.sh
Merge pull request #9 from eluizbr/devel

Devel
Create a2billing.conf
Delete a2billing.conf
Merge branch 'devel' of https://github.com/eluizbr/VOXIPBX
A2Billing updates
Merge pull request #10 from eluizbr/master

Devel