DyTask scenario (#406)

Stubbed out scenario class and created unit test.
Add todos and refactor
Add missing header
Updated todo
Correct PMD unused field warning
tests skipped
#441 upgrade to jcabi-ssh 1.2.1
#441 removed redundant resources from src/test/resources/com/jcabi/ssh
#449 Refectored update config methods
#449 Fix after review
#372 Implementation of txn method
#443 DyReposITCase
#405 Implement memo method.

Added DyMemo and related test cases.
todo: implement update method
#372: Implementation of txn method
Revert "#372 Implementation of txn method"

This reverts commit 83d8c088ac2e94df708d409bbec9ffb5c4f95cc8.
Update DyReposITCase.java
#372: Fix after review
Merge remote branch 'fork/master'
#445 NginxTest: improve readability by using VerboseProcess.