Removed internals, refactoring. #16
Removed common helpers test file.
Added imports, fixed test.
Removed local var.
Close writers in tests.
Close error + minor refactoring.
Merge pull request #17 from cihub/db_issue_16

Remove internal wrappers
Rolling log archiving option.
Minor refactoring changes.
Merge pull request #7 from cihub/db_issue_7

Improvement - option to archive rotated logs
Fix tests by making file writers lazy initialized. Make minor changes
Fix behavior-async-loop-off test by checking that log file not created at all.
Added 'line' format verb. Rfi #20.
Added Line verb to predefined formats.
Merge pull request #20 from cihub/db_issue_20

Current line format element
Minor makeup
Merge branch 'dev' into pk_issue_19
Merge pull request #19 from cihub/pk_issue_19

Fix tests
Added a bunch of FS utility functions for internal usage.
Changed the meaning of the input CA certificate file paths - now this are paths of directories with PEM files.