Update .mozconfig for Debian sid/powerpc build.

.mozconfig: Add changes enabling system ICU.

Update README.md

Update README.md

Merge pull request rmottola#161 from rmottola/dev

make 43.0

Merge pull request rmottola#161 from rmottola/dev

make 43.0

Merge pull request rmottola#145 from rmottola/dev

Prepare 42.1 release

Merge pull request rmottola#138 from rmottola/dev

42.0

Merge pull request rmottola#133 from rmottola/dev

prepare for 41 release

Merge pull request rmottola#123 from rmottola/dev

from dev - prepare for 40.1