Bug 839368 - Part 1: Fix ondialing event dose not propagate correctly
Bug 839368 - Part 2: Call should not become ACTIVE until receive 'gsm accept' from console
Bug 839368 - Part 3: Add last_call_fail_cause for REQUEST_LAST_CALL_FAIL_CAUSE
Bug 839368 - Part 4: Support reporting call error when dialling an invalid number
Bug 839368 - Part 5: Support reporting call error when remote is busy
Merge pull request #21 from EdgarChen/bug_839368

Bug 839368 - B2G Emulator: Support busy and invalid number in REQUEST_LAST_CALL_FAIL_CAUSE. r=vicamo