A lot of new stuff

By @gilesw -- thanks a lot, chap!

Restart whitness option added

Restart pgbouncer only when needed.

1.4.1

Merge pull request #5 from adriagalin/master

Fix pgbouncer default template file name

Added /etc/default file configuration

Merge pull request #4 from slimus/add-default-file

fix /etc/default/pgbouncer template; add task for correct start daemo…

Multiple databases fix

Merge pull request #3 from alexey-dushechkin/allow-multiple-databases

Allow multiple databases in pgbouncer.ini

Changed apt package state to present

Merge pull request #2 from kkonnov/package_present_as_default

set pgbouncer defautl package state as present

Add setting for controlling if pgbouncer must be updated

Merge pull request #1 from kkonnov/change_bgbouncer_state

changed pgbouncer state to "present"