Enable memcached.so

(cherry picked from commit 7ae941db3f7bd0c7d432b939c3de7cccb6bed757)

Conflicts:
	.travis.yml
Fix #1494
Fix Log Formatter getTypeString EMERGENCY bug

This fixes a bug that prevents the EMERGENCY log type being displayed correctly.
(cherry picked from commit 7cb8f4bb52a069a3146f7c69789dca384f499206)
Test case
Merge pull request #1493 from sjinks/memcached

Enable memcached extension
Merge pull request #1496 from sjinks/issue-1494

Fix #1494
Merge pull request #1498 from sjinks/logger

[1.3.0] Fix Log Formatter getTypeString EMERGENCY bug
Merge remote-tracking branch 'upstream/1.3.0' into Codeception