created a sqlite handler for nagios
Added a main SQL Nagios Check class and inheriting from it for SQLite and MySQL
modified path for nagios sql import
removed useless __init__ in nagios mysql check
Indentation fixes nagios_check_sql
Merge pull request #4 from Work4Labs/nmalzieu/JOP-478/job_pipe_spider_queue

created a sqlite handler for nagios
Merge branch 'staging'
WFU-4295 aware of the future
WFU-4295 reuse of for_timedelta_ago method
WFU-4295 change the method name
Merge pull request #6 from Work4Labs/vmeyet/WFU-4295/timedelta_aware_in_future

WFU-4295 aware of the future
draft of nagios redis check
finished up nagios redis check
no line break in nagios redis check
redis nagios: no need to get redis client if not redis_key is defined
SYS-796: checkpoint
SYS-796: included review comments
SYS-796: included review comments
check lite
SYS-796 improve parameters handling, and more clearer threshold caculation via method