added growth stats and average active displays to company stats table

refactored getDisplaysPerCompany and getDisplaysPerCountry into common method
updated growth stat calculation to no longer depend on query result order
updated dev tools

- removed unnecessary ci tasks
- upgraded packages
- removed unused jquery from bower since it keeps failing bower install
Merge pull request #48 from Rise-Vision/feature/google/daily-active-displaysPerCompanyForLast12Months

added growth stats and average active displays to company stats table