Adding email keyboard test.

Conflicts:
	tests/python/gaia-ui-tests/gaiatest/tests/functional/keyboard/manifest.ini

Conflicts:
	tests/python/gaia-ui-tests/gaiatest/apps/ui_tests/regions/keyboard.py
Merge pull request #13707 from AndreiH/bug938577_v1.2

Bug 938577 - [v1.2] Write a test for using the email keyboard