Adding content filtering capabilities (#9)

Adding mutexes to sync access to shared vbles (#8)

* Adding mutexes to sync access to shared vbles

* Release 0.5.4

Avoid exiting app on failure

Fixing bug while dealing with errors

Managing errors

Bump Version

Fix dockerimage creation process

Fixing ut (#5)

Fixing UT (#3)

Adding output options: json and raw (#2)

* Adding json output support