Properly skip SFTPLargeFileTest when environment variables not defined.
Update Code Sniffer to version 1.5.6
Use _MODE instead of the incorrect _ENGINE.

Partially reverts 0305a4827ccdb14b4746d6539e8813e214cd047e.
Merge pull request #563 from bantu/code-sniffer-1.5.6

Update Code Sniffer to version 1.5.6

* bantu/code-sniffer-1.5.6:
  Update Code Sniffer to version 1.5.6
Merge branch 'master' into php5

* master:
  Update Code Sniffer to version 1.5.6
Merge pull request #562 from bantu/properly-skip-SFTPLargeFileTest

Properly skip SFTPLargeFileTest when environment variables not defined.

* bantu/properly-skip-SFTPLargeFileTest:
  Properly skip SFTPLargeFileTest when environment variables not defined.
Merge branch 'master' into php5

* master:
  Properly skip SFTPLargeFileTest when environment variables not defined.
Merge pull request #564 from bantu/engine-back-to-mode

Use _MODE instead of the incorrect _ENGINE.

* bantu/engine-back-to-mode:
  Use _MODE instead of the incorrect _ENGINE.