Merge latest upstream oFono up to commit 278dba2ec85d8923dc36a151a1688a00a0d4317e.

Includes a bugfix related to MMS settings parsing in the MBPI plugin. Also, there are upstream test results (all passed) using this exact version, available at https://lists.ofono.org/pipermail/ofono/2014-February/015200.html .